Reliable 2400 baud C64 userport serial for CC65

This is an implementation of a reliable 2400b serial driver for the userport of a C64.

Based on George Hug's 'Towards 2400' article in the Transactor Magazine volume 9 issue 3. (https://archive.org/details/transactor-magazines-v9-i03)

I used parts of this fix to get around the 0x0d problem when a 0x00 byte is received. (https://modelrail.otenko.com/electronics/commodore-64-fixing-rs-232-serial-limitations)

Cheers, Johan

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