Basic (C64 v2): step0

Basic (C64 v2): step0

This works with cbmbasic from https://github.com/mist64/cbmbasic. The
cbmbasic interpreter needs to be on the PATH.

The actually sources are *.in.bas which are "compiled" to *.bas using
the qb2cbm.sh. qb2cbm.sh translates from a QBasic-ish format to a line
numbered source with include files inlined (REM $INCLUDE: 'file.bas').
One additional advantage is that the *.in.bas versions can also be
indented and qb2cbm.sh will remove the indenting in the translated
code.