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Add new API for the subdirs command to cmState.

This fixes a regression introduced in commit f716460e (cmMakefile: Move
invokation to initialize snapshot., 2015-10-06).

Don't leave this as cmMakefile responsibility.

Don't leave this as cmMakefile responsibility.

Don't leave this as cmMakefile responsibility.

Don't leave this as cmMakefile responsibility.

This is the appropriate snapshot for future use.  Existing users
of this method are mostly just calling GetDirectory on the result,
but the progress tracking of the Makefile generator needs a consistent
snapshot to be used, so the end snapshot should be consistently used.

This is a change in behavior from CMake 3.3, but there is no semantic meaning
to empty entries in buildsystem properties.  This also restores behavior to
that of CMake 2.8.10.

Match the scopes currently used in cmMakefile for definitions.

For completeness mostly.

Refactoring in commit 6ed9c7e0 (cmState: Host buildsystem properties for
directories, 2015-07-18) broke include_directories(BEFORE).  Fix it and
add a test case.

Implement lexical scope checking in terms of the state stack instead
of barriers.

At generate time, variables and policies are determined from the end
state of the cmMakefile.

This was added at a time when I thought the cmState would report errors,
but that is not the direction it is going.  The ordering of the stack of
scopes is canonical and clients are required to maintain it.

Brad King authored Jul 23, 2015 and Stephen Kelly committed Jul 25, 2015

Delay use of the PositionType constructor until after SnapshotDataType
is fully defined.

Move Directory-scoped state accessors to it.  This will be expanded
with directory property state soon.

Commit v3.3.0-rc1~196^2~7 (cmake: Simplify command clean up
loop., 2015-04-12) introduced a bug that built-in commands which
were renamed no longer had their original name restored when
cleanup is performed between configure runs.  Check for that
and restore the commands with their original name.

Extend the complex test for this. That test is run by ctest with
the --build-two-config command line option.

Extend snapshot creation API to store the file being executed and the
entry point to get to that context.

Adjust cmMakefile implementation to create the snapshots.

This will matter when definitions are stored in the cmState.

The chaining logic doesn't belong to the container, and the
CMakeInstance pointer doesn't need to be in cmPropertyMap.

Size goes from 56 to 48 bytes with GNU libstdc++-5.1.