Add new connector tips styles for start/end to mind map template
I just realized that connectors got the long avaited additional styles for start and end.
Unfortunately they are not available for mind maps yet. (Even worth, there is not even the ability of the old arrow direction toggle).
REQUEST: Ensure that new connector tips are also available for mindmaps (incl. inheritance to (new child nodes)
IDEA: keep also the previous direction toggle in addition, so that I as a user don't have to switch on/off tips to change direction. The pre-selected style should be kept.