Make Edge remote more flexible

Please,

let us make better use of the Edge remote, at least by:

- allowing to assign functions to the lap button. Most cyclists don´t need this function an it would be great to assign something else to it. The remote has only 3 buttons and one of them is more or less useless now.

- if a notification pops up on the edge unit make the first press on a remote button to quit the notification (as tapping on the screen). It is annoying to have to use the touchscreen, when else using the remote. Especially with screen-lock on during rainy rides (also applies to DI2 buttons)

- allow a function to switch to the first datapage in the Edge programming. If you have multiple datapages it would be nice to get to the first page without switching through all pages