Updates windows project to use the unified 'desktop/CCEGLView.h/.cpp'.
Updates includes path to 'desktop/CCEGLView.h'. And added windows relevant codes.
Updates cocos/2d/cocos2d.vcxproj.
Updates template CMakeLists.txt.
Updates cocos_files.json.
Merge pull request #5172 from dumganhar/use-unified-cceglview

Using unified 'desktop/CCEGLView.h/cpp' for Windows platform too.