[MONITOR] move ZP usage to BASIC area, honor RAM bank separately from ROM bank, enhance register dump/read #173
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… ROM bank, enhance register dump/read
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As discussed in #134 we want to avoid stomping on user ZP. There are enough scratch ZP locations that belong to BASIC that we can use while the monitor is running, so instead of preserving any ZP, we can simply take over those locations.
This PR also creates a new command
Kwhich changes the RAM bank, and can also be used to set VRAM/I2C modes. the oldOcommand is now for changing only the ROM bank.Other cleanup done as well.
Closes #111