X68000 Frog Feast text layer working.

I got the text layer working on the X68000 version of Frog Feast. It was a fairly painless addition.

I was expecting the text layer to be tile based, similar to the Genesis or something. Instead it is 4 seperate bitplanes. The bitplanes can be written to as a seperate bitplane or as 2 to 4 combined bitplanes. The palette is taken from palette #15 (zero based index).

The next planned additions are joystick reading and sprites.