Cogl, when built with the SDL winsys, includes the SDL headers in its
headers, which causes main() to be defined to SDL's main() wrapper on
Windows, which means that SDL2.lib and SDL2main.lib need to be linked to
every single program that links to Cogl with the SDL winsys.
Avoid this behavior by defining SDL_MAIN_HANDLED in the CFLAGS of the
sample and test programs, and let people know that this is the case.
This updates the Visual Studio 2010 Projects in the following ways,
similar to the recent changes to the Visual Studio 2008 projects:
-Make all the copying of the pre-configured header files custom build
rules, so that it is cleaner when people clean their builds, and the files
can be re-copied when updated.
-Split up the property sheets, so to ease future maintenance
-Make the cogl-path library built as a DLL
-Build and link against SDL-2.x for SDL builds
-Make everything except the .sln file and the README.txt file use UNIX line
endings, for easier maintenance.
-Merge cogl_sdl.sln and install-sdl.vcxproj into cogl.sln and
install.vcxproj respectively.
-Update build of the conformance test to not use COGL_COMPILATION, and make
it link to cogl-path.
