Just ignore the color in the component.

- editor and player have their own services to handle the errors

- remove 'own' as possible connection

- to allow the display properties to be overwritten

- remove 'none'

Also refactor a lot of stuff around the page canvas and unit view.

#684

Also add separate file to handle drop-logic.

#671

All created IDs are now always registered as well.

#691

- Due to the width of the scrollbar, text areas change their inner width
under Chromium when the scrollbar is displayed. The use of offsetWidth
instead of contentRect ignores the presence of the scrollbar. The
calculation is therefore less accurate, but sufficient for estimating
the number of rows

#664

The background color is set via data-attribute so it can be turned off 
for the parent div but still used in the child (button).

For Table compatibility.