Live window resizing on Windows
Custom implementation for resizing (GHOST_SizerWin32)

Some things still don't work:
* esc cancel
* max windows size
* aero (sizing) snap on win7

hbrBackground = 0 to disable clear screen.

Thanks to dfelinto for help in finding of root cause.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55925 954f8c5b-7b00-dc11-b283-0030488c597c