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This reverts commit 3167729a

This puts global state change logic with the rest of the global state
management logic. This also makes it possible to create temporary Pad
objects without triggering plugin actions.

This improves the accuracy of the timing stats, and it simplifies
error handling.

Use a log4js logger instead of `console`, and clean up some of the log
messages.

This also fixes a double-count bug.

Looks like this was accidentally deleted in commit
4a65acf4.