Changes

Limited Gate/Trigger rewrite

Moved most of the Gate logic out of Pipe and into Gate. Expect some NPEs
on pipe.gate.

Converted the Trigger/Action API to key off of unique Strings instead of
IDs. Legacy conversion code implemented as well so it shouldn't affect
worlds.

Simplified Trigger/Action Icon functions. No more indexes.

More busy work is needed to convert the existing Triggers to the new
code.
 (commit: 311078d)

Trigger busy work

Adapted old Icon framework to new API, reducing amount of busy work
tremendously.

Mostly what remains is providing unique tags for the triggers.
 (commit: a194700)