Board XH-M188, ALIAS Feature, Issues #25, #26, #29, #30

Board XH-M188 (Issue #29)

@hexagon5un contributed initial support for the board XH-M188. Thanks a bunch!

After removing the socketed 7S-LED display the board offers a GPIO breakout, and standard RxD/TxD communication ports.

ALIAS Feature (Issue #26, #27)

@RigTig needs more free Flash memory for the application. As Forth headers require a lot of memory he proposed loading Forth headers to RAM. With the help of some minor changes to forth.asm (e.g. enhanced NAME>) about 2000 bytes of Flash memory can recovered. Please refer to the discussion in #27.

Words last and NAME> used in RECURSE example linked

The recursive programming example requires last and NAME> to be exposed. That's fixed now.

Happy hacking!