- Add a span to the edited text line to provide a highlight
- Scroll and highlight for switch checkboxes also
- Clean up initialization
- More API documentation
- Smarter handling of asynchronous file loading during init

- Animate scrolling to the edited item’s position
- Sanity check file drops and show warnings
- Fix form init / refresh on new configuration drop
- Document the API methods that get/set defines

Browsers may not want to load files outside the folder, but they may be
okay with these relative references within the folder.

- When initializing fields use the configuration to determine the format
- Cache the line for each option for fastest string compare / replace
- Add logging levels for debugging

- Specify HTML5
- Allow drag and drop for loading configurations

- A web form with fields for configuration values
- Reads and parses standard config files
- Modifies configurations dynamically in-place

Example Configuration.h: fixed strange white characters preventing
compilation in lines 1 and 3 - oops

Example Configurations for K8200 readme.md updated
* readme.md: added description for german umlaut support on LCD

Example Configuration_adv.h for K8200 back in sync
* Configuration_adv.h: rebased and added missing changes for 4th
extruder

Example Configuration.h for K8200 back in sync
* Configuration.h: rebased and added missing changes
* Configuration.h: updated comments for K8200

New function now drops the prechar (select character) and makes the first
column usable for text.
Marking the line is now constantly made by highlighting (reverse).

Replaced selection code in:
lcd_implementation_drawmenu_generic()
_drawmenu_setting_edit_generic()
_drawmenu_sd()

with new function.

Combine 1/(rows+1) with u8g.getHeight() to get rowHeight and just use
that.

- Patch from #1453 for delta movement plan
- Fix: Set X with code X instead of adding to X

Prework for issue #1448 and #1447

Will merge in when pull request #1457 is in.

Replaced calculation to centre bitmap with fixed values.
Saved 20 bytes.

and win another 1694 bytes.

No visible impact.

Select DOGM-displays automaticly.
Give hint where to find charsets.
Add '²' and '³' characters.