New Addressing Modes implementation.
Update the opcodes for new addressing modes.
Special case the "mixed mode" handling of ASL/LSR/ROL/ROR.

This allows us to pass the test suite but causes the time to run
tests to double and our consing goes up by a factor of 10-20!
Investigate. We get through ~11325 in 12 seconds before this commit,
through 15415 in 20 seconds after.
Fix overflow-p consing madness.
Export reader/writer/getter/setter for Addressing Modes.
Fixup addressing mode tests.
Rewrite defenum to use hash tables. If famiclom needs something fancier, it can implement it.
Inline wrapping functions and stack push/pop.
Release: 0.9.2!
Minor cleanup since we don't need to intern since... 0.8.8.
Fixup occasionally used perf functions.
Bugfix: On reset, the PC should be set to the *raw* absolute address.
Minor style tweaks.
Inline set-flags-nz and rename style->raw-p.
Add basic structure.
Switch to literate-style markdown comments.
Update the README.
Add packages for completeness. Stub out intro/conclusion.
Update some things for the upcoming book release.
Minor README tweaks.