Add leaphelp() Lua builtin function for help on LEAP operations.

leaphelp() (no argument) shows a list of all LEAP APIs.

leaphelp(API) shows further help for a specific API.

Both forms query LuaListener's LeapListener and report its responses. In
future we might reimplement leaphelp() as a Lua function.

Add LuaState::getListener() method, which checks whether there's a LuaListener
associated with this LuaState and returns a pointer if so.

Add LuaState::obtainListener() method, which finds or creates a LuaListener
for this LuaState and returns its pointer.

Both the above use logic migrated from the Lua listen_events() entry point,
which now calls obtainListener() instead.

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