ga-client: alt-enter switching between fullsreen and windowed mode
ga-client: refine fullscreen switching codes
upgrade ffmpeg (to 2.1.1) and SDL2 (to 2.0.1)
win32: upgrade ffmpeg (to 2.1.1) and SDL2 (to 2.0.1)
include build of coreaudio hook support into vs2010
win32: bug fix - capture-cursor sometimes crashes when mouse moved to screen top
revised implementation on grab input
support resizable ga-client window
revised: resizable ga-client window - no max. size limit
Merge branch 'master' into devel