ActiveSync Settings

## Add the missing ActiveSync page.

This will become the complete reimplementation of the ActiveSync Plan settings page.

### Don't Merge until...
- [ ] UI is completely ported from the old CloudPanel.
-  [x] Place all input fields.
-  [ ] Add tooltips.
-  [ ] Add "required" asterisks.
- [ ] ViewModel is complete and verified to be functioning.