- Use type 'no-value' as fallback value
- Send info also for state variables with type 'no-value'

- Reset shift key when switching between layers

#744

- Fix hidden shift keys of numeric layout

#744

#744

- Distribute the math editor module to different files

- Replace top layer with inline editor
- Make keypad and keyboard available for TextAreaMath

This was changed without reason, but is actually a good (default) value.

Sections always need an IDService.

1. Check if an alias is present, so that the constructor creates one.
2. Only register the value IDs, when creating a valid element. Invalid 
elements generate and register IDs in the constructor (else path).

All page views were wrongly updated with the selected page instead of 
keeping the page index they were responsible for.

Should solve all issues with initializing Geometry elements.

#735

#738