feat: redesign layout

[wolf31o2]

Redesign the layout to take advantage of larger screens and our more flexible capabilities.

• Multiple data refresh timers for background data collection
  • Process metrics
  • Prometheus metrics
  • Epoch counter
  • Uptime counter
  • Peer filter
  • Peer pinger
• Reduce app/screen refresh to 1s
• Remove (i)nfo and (t)est text views
• Replaced lots of magic numbers with new magic numbers for layout (to be improved)
• Rearrange layout into multiple text views and named flex boxes
• More functions
  • getEpochProgress / getUptimes
  • setRole / getP2P
  • filterPeers / pingPeers
• Migrated peer-related functions to peers.go
• Populate a Map and Slice from peer RTT results