Support `$` event

[RDIL]

grape found a special property, $, which, when used as an event name, runs on every event.
We should support it.

[grappigegovert]

Anything that starts with $ will work, actually.
I found it by accident when I used $Timer instead of $timer.

[RDIL]

Does that also mean timers can run outside of events named $timer?