ceify the metro lib about crow

[tehn]

definitely don't need module control --- and i really don't think we need module query either. those are both really for dynamic management which i can't see being useful in the crow context.

it's true, metro is really nice in that it's so simple.

[trentgill]

this is done in #471 which passes my basic testing of the published API (https://monome.org/docs/crow/reference/#metro) and a little more for direct setting of parameters of the clock with assignment syntax (metro[n].stage = 23 to set the current metro counter)

[trentgill]

Closing this issue as i've built & tested the ceified library. It could be merged if we need/want.

Secondly, the whole motivation for this ceification journey was perhaps unfounded. It was trying to solve out-of-memory issues thinking they were the cause of failing clocks / timelines. turns out that was not the issue (it was a bug in the clock.sync implementation), so i'm closing this issue as it doesn't actually fix anything directly.

of course we can continue this endeavour if we find we need to free up RAM in the runtime, but it's not a limiting factor right now, so i'm closing this.