[win32] add cmake C/CXX compiler flag override files
[win32] extend ARCH_DEFINES for binary addon builds
[win32] add an "install" switch to make-addons.bat to install built binary addons to <root>/addons
[win32] cosmetics in make-addons.bat and make-addon-depends.bat
[win32] extend make-addons.bat and make-addons.bat to be able to build specific addons/depends
cosmetics in binary addon's CMakeLists.txt
cmake: clarify README of xbmc-addons project
Merge pull request #5055 from Montellese/binary_addons_win32_improvements

cmake: some win32 fixes