Show correct number of console lines in narrow windows

It was showing too few.
Get loading screen info from gameconfig.txt

Show client loading screen at vid_restart.
Support 200 loading shaders, each with their own aspect and background color (for when image is different aspect than window).
Loading images are always drawn aspect correct, scaled to fit window width/height.
Next loading screen index is set by cl_loadingScreenIndex. Client auto incraments it, cgame could limit and allow more over time.
Merge remote-tracking branch 'spearmint/master'

Conflicts:
	code/client/cl_main.c