Support using hardware scaling on the GCW Zero.
Frontend: Use solely command-line argument ROMs. Remove the ROM browser.
Document the HARDWARE value of the Full Screen setting in the manual.
Fix drawing routines to properly use the pitch of a line on the screen.

* SAL_SCREEN_ROTATED is removed.
* SAL_SCREEN_X_STRIDE_* and SAL_SCREEN_Y_STRIDE_* are removed.
* The pitch of a surface is gotten using sal_VideoGetPitch() instead of being a #define.
Merge branch 'file-selection'
Merge branch 'ipu'

Conflicts:
	Makefile
	menu/main.cpp
Update the release date.