Add support for reading framebuffers to memory.

Signed-off-by: arnastia <arnastia@gmail.com>
Small fix for debugger (GWL_WNDPROC isn't defined for 64bits, wouldn't compile).
Merge remote-tracking branch 'upstream/master' into framebuffers-to-mem
Add FramebuffersToMem option to allow disabling of reading framebuffer contents to memory (defaults to false).
Merge branch 'framebuffers-to-mem' of https://github.com/arnastia/ppsspp into arnastia-framebuffers-to-mem

Conflicts:
	Windows/Debugger/Debugger_MemoryDlg.cpp