Prevent editor toolbar being too small, at least for left-aligned elements

If there are only floating elements, the Dojo toolbar shrinks to 0 height.
To prevent this at least for left-aligned elements, do not set them as
float:left. (Also reorder generation to keep current tool ordering)

No idea yet how to solve supporting right-aligned toolbar elements, which
seem only possible with float:right styling. So if alone on the toolbar,
or if being the first element moved to a new line on shrinked toolbar width,
then still the toolbar is rendered too small.

Floating elements seems also the reason for #468