* start on separating 6502 variants from cpu itself
* add a single variant: the NMOS one
* get examples & tests running again
* Add the Revision A variant, one that has no ROR
* disable failing lint in build-time dependencies
* Variant with no decimal mode
* Revert "disable failing lint in build-time dependencies"
This reverts commit c87975e9374e99b593ab20e6f87d7c01cc7ffd03.
* some doc comments
* specify the variant in unit test now the API has changed
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Co-authored-by: Sam M W <you@example.com>