M5PaperOS

I'm improving on the m5stack/M5Paper_FactoryTest, fixing bugs and adding functionality.

Improvements so far

• Moved Wi-Fi configuration into Settings app
• Added Wi-Fi indicator to status bar
• Added DejaVu-Sans in order to see utf-8 icons
• Extended Wi-Fi connection timeout to establish connection more reliably
• Preventing Wi-Fi from disconnecting
• Automatically syncing time after Wi-Fi connection was established
• Removed unused button from keyboard and enlarged number-alpha switch
• Increased back arrow size to prevent labels from beeing cut off
• Made some visual improvements to the UI

Bugfixes so far

• Fixed bootup sequence to automatically connect to saved Wi-Fi network
• Added missing dependency to platformio.ini
• Fixed typos and misspellings
• Fixed label centering issues

Other changes

• Removed poorly implemented language selection
• Renamed WLAN to Wi-Fi