Macpow: Real-time power tree TUI for Apple Silicon

Welp, this puts my https://gist.github.com/nhecker/8e850773ff229724ce361967cc22... to shame.

I wonder about the battery SoC being reported with macpow; there are several different ways to calculate that metric and it's not clear which is being used. I may dig into that if I get the chance. Neat tool!