cc64 v0.13

[pzembrod]

v0.13 updates the VolksForth build base from 3.9.5 to 3.9.6 which
slightly reduces the size for the Commander X16 version of cc64 and also
should make it much more robust against new Commander X16 ROM releases.
A visible consequence of this change is that cc64's command line now uses
the regular Commodore screen editor.

For the records: v0.13 was tested with ROM R47. v0.12 works with R47, too.

The Commander X16 version of c-charset is now
working correctly; in v0.11 I had forgotten to adapt it to use the changed
bank switching address of prototype#2 and subsequent boards. Thanks to leop
for pointing this out to me.

Minor changes: Scratching of temp and output files before, during and after
each compile run was fixed and refactored. The src/samples/ dir
contains some code I wrote inspired by the Vintage Computing Christmas Challenge 2023.
And the run-in-x16emu.sh script doesn't use the generated SDCard image anymore
but runs directly off the x16files/ dir using x16emu's -fsroot option.

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This discussion was created from the release cc64 v0.13.