Watchy Watch Face, cleaned up codebase

Features

Cleaned up display library
Cleaned up RTC library, stores time in UTC, pass an offset when reading time
Non font-based 7 segment display
Removed wifimanager, hardcoded SSID / password in secrets.h
NTP sync on initial boot
New, more flexible, much more easily edited menu system
Multiple pages, currently has main clock and weather pages
Weather page uses wttr.in API, and optional geolocation using ip-api.com
Sunrise / sunset times, moon phase display
Refactored a bunch of stuff into WatchFeatures instead of being part of the Watchy class