- Remove unused imports

Windows convertibles were not recognized as mobile devices by this check

#596

- Not defined intersectionDetector leads to error

- InViewDetectionDirective determines the container itself
  as the previous binding returned an undefined value

- Resolve the conflict between the browser behaviour in concat scroll
  snap mode and the scroll button with delays
- Add space at the bottom of each page to ensure that the user
  can reach every element

- add padding
- add stopping on every page
- change selected index recognition

- Replace throwing Errors with InstantiationErors in unit, page and
  section in strictInstantiation mode

#547

- Remove all Roboto files

Since there is just one font, this setting can be safely ignored. This 
is easier than sanitizing all elements.

#529, #530

- Changes were required due to material update

#528

#461

#461

#461
- This property will be used for all input assistance presets
  in the future

#397

#520

- Use own StateVariableStateService which uses the same new base class
as UnitStateService

#525

#511