Resolve "Ordering fields per grid view"

Closes #100 (closed)

How to test

You should be able to drag a field to another position in a grid view. This can be done by pressing the left button while pointing at the field name.

Test pointers

• This should work in combination with the real time collaboration.
• The field should still be in the same position when refreshing the page.
• When dragging a field out of the view port, it should scroll horizontally.
• When a new field is created it should always be last.
• The old position should stay intact right in existing tables that haven't ordered the fields once.
• While dragging it should look like the image in this description.
• The dark line should indicate the position where the field is going to be placed.
• No request should be made to the backend if the field hasn't changed position.
• Pressing the ESC key should cancel the current operation.