Cross compiling on linux failed on this file. Changing case of the windows.h and shlwapi.h allows mingw to find these headers but setting WINVER 0x0500 is needed for the compiler to find ReplaceFileW
Added support for 2D shadow casters.
*DANGER* Shaders in CanvasItem CHANGED, if you are using shader in a
CanvasItem and pull this, you will lose them. Shaders now work through a
2D material system similar to 3D. If you don't want to lose the 2D
shader code, save the shader as a .shd, then create a material in
CanvasItem and re-assign the shader.
