preliminary byond tick based timers

[vuonojenmustaturska]

This implements timers that are ticked from byond via /world/Tick(), there being roughly 5 ticks a decisecond. Dividing the input by tick_lag might provide better "deciseconds as expected by byond" api.

Might make sense to throw this stuff in the same file with real-time timers because they share a lot of code, and just make real-time vs. byond-time an argument for the timer functions (or macros).

[ZeWaka]

Hmm yeah it probably makes sense to have maybe a core timer file and then a real time and a byond one with the args and extra bits.

[vuonojenmustaturska]

the rand dependency is basically what v4 uuids use if you use fast-rng feature, the custom uuid generation is a mix of what the uuid crate does with v4 and v8 generations, with the first byte forced for our convenience

[vuonojenmustaturska]

We're not actually limited to UUID ids, the helpers just come out of the box, so maybe our own ID type might be worth considering