[UXTHEME] -Rename WND_CONTEXT to WND_DATA to avoid confusion with the DRAW_CONTEXT...

[UXTHEME] -Rename WND_CONTEXT to WND_DATA to avoid confusion with the DRAW_CONTEXT. The WND_DATA is information valid throughout the life of a window and DRAW_CONTEXT is information throughout a draw operation in the non client area of the window.

svn path=/trunk/; revision=74587