WIP: better power management in epicardium

main features: auto display dim, auto display sleep, power indicator

still very very beta, but will be cool when it's done i think =D

Sorry, it looks like this Merge Request has some code quality issues!

The pipeline lint has failed - look at its failure output to understand what sort of diffs we'd like you to apply.

You can also use tools/code-style.sh to fix files that have issues.

Good luck! I will update this comment when I detect you have applied your fixes.

added 3-Epicardium 3-Module 6 - Needs Review labels