Begin work converting to SDL2

Converted BT1 graphics from 8 bit palettized images to 32bit RGBA to
prepare for moving to SDL2
BTE converted to SDL2
Begin converting BT1 to SDL2
BT1 conversion to SDL2
BT2 conversion to SDL2
BT2 conversion to SDL2
Merge branch 'master' of https://github.com/ChrisAubuchon/bard

Conflicts:
	bte/Makefile.am
	bte/Makefile.in
	bte/bte.c
	bte/btf.c
	bte/l_sdl.c
	bte/l_sdl.h
	bte/sdl/l_anim.c
	bte/sdl/l_img.c
	bte/sdl/l_rect.c
	bte/sdl/l_renderer.c
	bte/sdl/l_surface.c
	bte/sdl/l_textbox.c
	bte/sdl/l_window.c

wtf