- Remove the delay when opening the math keyboard in favor of an
explicit check

- Fix display of multiple spaces entered
- Fixes error on Chromium-based browsers when focussing empty
AreaTextInputs

- they are cut off in container mode
- cannot be used on iPads

This makes the element ID predicable and allow for better testing.

- 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