Progress so far:
- webview is created upon watchapp launch
- webview is destroyed after disconnect
- ready event is fired in the background
- showConfiguration is fired upon webview display
This is not needed as long as one GB instance is used to manage a single pebble device, if multiple devices are managed the stored watchapp configuration could be messed up.
LocalStorage native functions are overridden to keep each watchface's settings separated. It's possible the bind method do not work on older versions of android.
- localstorage is now cleared at every launch: this prevents some clay configuration pages to send back to the watch a number of keys that were set by other configuration pages
- only execute JS on document ready: this prevents some race conditions
- added dummy getTimelineToken function to Pebble JS object
- corrected (hopefully!) a few logic errors in the JS code (this referenced where it wasn't)
- refactored the steps visualization in JS
- lifecycle changes to the java activity: now the configuration page gets closed as soon as the settings have been sent, and there is only one instance of it
