* Cleaned up some more of the Lua inteface. Mostly replacing methods
with properties, some consistency fixes, a few renames, some more
exposed functionality, and a couple of properties that have no
business being set from scripts made read-only.
* Moved a lot more Lua documentation out of source comments into the
documentation, and expanded on it in the process.
* Got more UI code out of the input manager.
* Changed input sequence poller to a polymorphic class where you
specify your intention upfront.
* Changed the cheat plugin to use UI Clear to clear hotkey assignments
and leave them unchanged if the user starts assignment but doesn't
press any switches.
* Ported AJR's fix for over-eager double-click recognition from SDL to
Windows OSD.
-goldnpkr.cpp: Cleaned up inputs, using standard keyout and payout types
and key assignments.
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