This is a modified version of the ROMX Real-Time Clock driver. The changes include:
* Converting the source to ca65.
* Integrating with the driver installer framework.
* Adapting the driver to not modify page 2 beyond $220. The ROMX RTC
firmware writes bytes to $2B0, and the the original driver placed
temp code at $250. This can conflict with ProDOS applications that
use page 2, so the driver was reworked to save/restore anything at
at $2B0.
Other changes:
* Add a util/ source dir, and cricket/date, quit.system and
pause.system there.
* Pull the "print current date" logic out of clock drivers into driver
preamble.
