New layout in app, bugfixes, various stuff

- changed: new design in the android app, added 2 drawables, switched
from Switch to ToggleButton
- changed: teamviewer related buttons are now in the menu button on the
top-right
- fixed: confirmation dialog cancelation causing permanent timer
stopping
- fixed: "no connection window" while in the timer thread causing
chrashes (now running dialogs from UI thread)
- fixed: various indentation stuff
- updated: readme to reflect new changes (also added a note)