Fixed blit optimized issue, added opaque blit

use BLIT_STYLE enum to set either ALPHA or OPAQUE blit style, only
implemeneted for blitBuff_opt so far.
Badgy bird can flap!!
Badgy bird work

Can fly up and down in place with G like the real game. Need to add
pipes and collisions
Prototypes and things setup
dates changed in makefiles....