EPS: periodic logging of power usage and disabling channels when issues are discovered.

[2BlackCats]

Issue #186

[NuclearTea]

Great Work overall.

Just some quality of life things.

Nice

[DeflateAwning]

Can you please rebase? Can you please explain what criteria/thresholds you've selected for disabiling active channels.

Issues I see with the current approach:

1. Thresholds should be factored out into clearly-named variables.
2. I'm not sure this logic represents a failure mode at all: vpid_eng[channel].current_mA - prev_vpid_eng[channel].current_mA > 1000. Why would the current draw changing instantaneously represent a fault condition? I think the actual way to implement this needs to be setting expected current draw maxima for each channel.
3. We should probably merge this with the EPS watchdog thread. We're getting too many threads, which will cause us to run out of memory. The actual actions parts should be refactored to a function, which is called from within a thread. Logging in one function, and power management in another function.
4. Needs configuration variable for setting the period of the logging and which logs we want to enable.

This looks like a solid start though, thanks!