TOOL_EVENT message is supposed to contain string as parameter.
Added missing header for class_drawsegment.h (KiROUND).
Renamed SELECTION_TOOL::containsSelected() to SELECTION_TOOL::selectionContains().
Modification point is selected basing on the number of selected items.
Rotation angle setting (Preferences->General) is taken into account while rotating.
Modifications done using the EDIT_TOOL are saved using the default KiCad's undo buffer.
If there is only one item selected, info about the item is displayed in the bottom status bar.