Merge topic 'doc-3.5-relnotes'

Help/release/3.5.rst

Help/release/dev/CMakeParseArguments-native-impl.rst

Help/release/dev/ExternalProject-git-clone-o.rst

Help/release/dev/FindBoost-imported-targets.rst

Help/release/dev/FindFLEX-DEFINES_FILE.rst

Help/release/dev/FindGTK2_GTK2_TARGETS.rst

Help/release/dev/FindGTK2_sigc++_c++11.rst

Help/release/dev/FindGTest-imported-targets.rst

Help/release/dev/FindOpenMP-clang.rst

Help/release/dev/FindOpenSSL-msvc-static-rt.rst

Help/release/dev/FindPNG-imported-targets.rst

Help/release/dev/FindTIFF-imported-targets.rst

Help/release/dev/FindXalanC.rst

Help/release/dev/FindXercesC-imported-targets.rst

Help/release/dev/add-armcc-toolchain.rst

Help/release/dev/add-cray-linux-platform.rst

Help/release/dev/better-looking-mac-packages.rst

Help/release/dev/cmake-E-multiple-inputs.rst

Help/release/dev/cmake-E-time-quoting.rst

Help/release/dev/cmake-W-options.rst