- implemented history for any object extending BaseClass (i.e. almost any)
- added distance() calculation method to base class
- Button "edit JSON" in Action Lists now hidden by default, can be enabled in plan properties
- fixed bugs:
- updating json of DisplayText was not working properly
- log output in Tile.isFreeFor was broken
- threads are no longer pooled (this makes naming threads difficult)
- threads are now named by their causing event, which improves logging
updated calls to thread.sleep: those are now provided by new class Delayed Execution
