4.0.0

See merge request Nicolas.Boeckh/la_app_xos!1

Removed statefulness, fixed handler, POST requests, added map, fixed user interaction, fixed my own stupidity, etc.

+ BluetoothButton
+ INTL messages
+ BT Connection Handling

Need to add checks, need to complete device connect/disconnection, need to hardwire UUID's (I think)

Started BT Selection dialog, remigrated to `flutter_blue` from `rx_ble` because I started understanding `StreamBuilder`'s

Ventured into platform specific code (used for getting battery values but necessary for BLE, sadly), added a whole `THOUGHTS.md` recapping the resources visited.
[x] Android
[ ] iOS

0.0.1 - Internationalization (because lack of interest in 20+hours of refactoring), Services placement, redefined project for flutter/kotlin compliance

Added routing between main and stats page (not one single page), added animation, flutter upgrade compliant.