alarm: toggle alarms from main menu

[thyttan]

This will let the user toggle existing alarms, timers and events from the main menu of the app. Either by long touch of the menu entries or by touch on the icon on the right.

This change requires to send the touch event used in showScroller through to alarm app. Both showScroller and showMenu needs changes to make it work. So in this draft state of this PR I add two boot files for modifying those two functions. Have a look at the individual commits to see the diff from firmware version, which I copied over and committed unchanged before tweaking them.

Test it via: https://thyttan.github.io/BangleApps/?id=alarm

The tests fail for the showMenu boot file, but it works on the watch. Enough for testing purpouses.