REMOVED: core_basic_window.cpp

1) use the latest windows SDK not a specific one.
2) use the project dir as the root for the include dir for raylib, to help if the project is ever included in some other solution.

NOTE: When building for 64bit in raylib static mode, CloseWindow() symbol collides with user32.lib symbol. No solution for that at the moment, just compile raylib as shared library (raylib.dll), actually it can be chosen on project configurations.

Now it's required on Windows if not using a busy wait loop