cc64 v0.9

Main topic of v0.9 is compile speed. With the help of a simple profiler
I was able to optimize a few performance hotspots in the scanner and in
the scanner/parser interface, resulting in more than 20% compile time
saved or more than 30% speed gained.

Also, Source code listing during compile can now be switched on and off.
Default is off; it turns out that switching off listing decreases
compile time by another ~10%.