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They are unused, but if someone used them they would lead to
problems since they would copy the internal raw pointers
and the destructor would cause double delete

Refactors the cmSourceFile::FindFullPath method to
use lambdas.

All cmSourceFiles are checked at least once whether they're `GENERATED` or not.
This adds a convenience method `GetIsGenerated` that returns a private
boolean cache variable `IsGenerated`.  `IsGenerated` is updated every time the
`GENERATED` property is written.

Primarily, this includes:

  - the rule files generated for custom targets;
  - source files representing custom targets directly;
  - outputs of custom commands;
  - byproducts of custom commands; and
  - dependencies of custom commands.

The ambiguous extension logic is an old behavior that ends up taking
lots of extra compute cycles to execute. This is triggered by various
CMake codepaths which pass extension-less paths down when CMake actually
knows that they are not ambiguous. These codepaths will be indicated in
upcoming changes.

Various APIs have gained a cmSourceFileLocationKind parameter, but they
are all optional and default to the existing behavior.

Also remove `#include "cmConfigure.h"` from most source files.

Extend the Resources group regex to match pdf, png, jpeg, jpg,
storyboards, and xcassets.  This cleans up more complex Xcode projects a
lot.

While at it, factor the regular expressions for both "Resources" and
"Source Files" into macros.

Automate with:

git grep -l '#include <cm_' -- Source \
  | xargs sed -i 's/#include <\(cm_.*\)>/#include "\1"/g'

git grep -l '#include <cmsys/' -- Source \
  | xargs sed -i 's/#include <\(cmsys\/.*\)>/#include "\1"/g'

git grep -l '#include <cm[A-Z]' -- Source \
  | xargs sed -i 's/#include <\(cm[A-Z].*\)>/#include "\1"/g'

Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace CMake per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online information
available from "https://cmake.org/licensing".  The online URL also handles
cases of modules being copied out of our source into other projects, so we
can drop our notices about replacing links with full license text.

Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority
of the replacements mechanically.  Manually fix up shebang lines and trailing
newlines in a few files.  Manually update the notices in a few files that the
script does not handle.

Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Each source file has a logical first include file.  Include it in an
isolated block so that tools that sort includes do not move them.

Size goes from 304 to 296 bytes.

The filename extension call is expensive, so cache the .ui check.

Clang based tools running over the code complain about these,
but clang has a fixit for removing them.

Property names are always generated by CMake and should never be NULL.

Drop all DefineProperty calls for non-chained properties.  Drop the
documentation from the chained ones.  The documentation for all
properties is now in Help/prop_*/*.rst files.

Our Git commit hooks disallow modification or addition of lines with
trailing whitespace.  Wipe out all remnants of trailing whitespace
everywhere except third-party code.

Run the following shell code:

git ls-files -z -- \
 bootstrap doxygen.config '*.readme' \
 '*.c' '*.cmake' '*.cpp' '*.cxx' \
 '*.el' '*.f' '*.f90' '*.h' '*.in' '*.in.l' '*.java' \
 '*.mm' '*.pike' '*.py' '*.txt' '*.vim' |
egrep -z -v '^(Utilities/cm|Source/(kwsys|CursesDialog/form)/)' |
egrep -z -v '^(Modules/CPack\..*\.in)' |
xargs -0 sed -i 's/ \+$//'

Commit 328c0f65 (Simplify cmVisualStudio10TargetGenerator source
classification, 2012-03-19) introduced the first use of source
classification from cmGeneratorTarget (which originated as Makefile
generator logic) in a Visual Studio generator for handling of header
files.  Fix classification of header files to match known header
extensions instead of only the HEADER_FILE_ONLY property.  Make it
consistent with the "Header Files" source group.

set_property() has APPEND, which creates a list. E.g. when
appending to COMPILE_FLAGS a string is needed, not a list.
With the APPEND_STRING option the value is append as string,
not as list.

Alex

Previously we reported only the CMakeLists.txt file in the directory
that adds the target.

This converts the CMake license to a pure 3-clause OSI-approved BSD
License.  We drop the previous license clause requiring modified
versions to be plainly marked.  We also update the CMake copyright to
cover the full development time range.

ENH: In cmSourceFile::GetLanguage use the file extension (if not ambiguous) to determine the language without requiring the source file to exist.

BUG: Add cmSourceFile::GetPropertyForUser to centralize the LOCATION property hack.  This fixes the LOCATION property when retrieved via the get_property command.

ENH: Add AppendProperty methods for use by C++ code in CMake.  Simplify implementation of SET_PROPERTY command by using them.

ENH: Added cmSourceFile::GetLocation method to get a read-only reference to the Location ivar.  This partially addresses issue #6137.