cc64 v0.7

v0.7 is the first properly defined version, with a labeled github release.

v0.7 brings two major changes: a new build base, and a C16/Plus4 port.

The build base has been updated from my custom C64 UltraForth 3.82 version to VolksForth 3.90. Note that UltraForth was the earlier name of VolksForth's C64/C16 versions.

VolksForth C64/C16 3.90 has the fixes and enhancements (esp. UNLOOP) of my 3.82 as well as my simple INCLUDE implementation for loading .fth files integrated into the core system. It also offers a lite version without the BLOCK mechanism for loading d64 screen sources which cc64 doesn't use anymore.

Thus, cc64 is now built on stock VolksForth 3.90, which enabled the second major change: porting to C16 (with 64k) and Plus4. As of v0.7, cc64 runs hosted on C64 as well as on all C16 variants with 64k. Target runtime libraries for both platforms are available on both hosts, enabling cross-compilation.