Minor changes.
Add tool activation delegate.
Split Tool into two classes: Tool and ToolAdapter.
Minor fixes.
Adapt RotateObjectsTool and MoveObjectsTool to new tool base classes.
Split off VertexToolAdapter.
Adapt map views and tool box to new tool structure.
Improve handle clicking and mouse click handling.
Split CreateEntityTool and fix a couple of bugs related to entity change notificatoins.
Merge branch 'feature/split_mapview_tools' into develop