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

- add packge cortex: needes for math-live

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

#733