allow for long action buttons
refactor modeHandlers and actions, create actions every time when handler is clicked
Delete last point action (fix #229, #236)
forgot to remove debug property
text → title for toolbar buttons
do not add empty toolbars (fix ie8 artifacts)
Merge pull request #242 from Zverik/undo

Refactor toolbars, add "delete last point" action (fix #229, #236 and probably some others)