Improve UI that allows to move elements without drag and drop

[Inwerpsel]

The drag and drop re-arrangement doesn't work on touch screens. An alternative way was added (the "Move elements" checkbox which shows area dropdowns), but it's incomplete and has a few bugs.

• Can't move to specific location in area (you have to move in the right order)
• Positioning of the dropdown is not great
• A bug in the moving code causes the order and position to revert partially in some cases (occurs more if a lot of elements were not moved yet)

Some ideas:

• Up and down buttons
• And/or 1 big dropdown with all possible positions in each area
• Try a drag and drop-like experience on touch (probably can't use the same code though)
• Or tap once to go into a mode where another tap will move to that location

The impact is quite high as it makes changing the UI on touch screens a painful process.