- added selection of reference point
- added snapping when pasting
- some minor code refactoring
- disabled pasting between footprint and pcb editors due to model incompatibility
- added TOOL_INTERACTIVE::resetTransitions()
- made protected and moved TOOL_BASE::setTransitions() to TOOL_INTERACTIVE
- TOOL_MANAGER calls TOOL_INTERACTIVE::resetTransitions() instead of
setTransitions()