LOW/ First commit of freeplane adapter.

Support:
	- Load 
	- Save (even if not automaticly checked on `ctrl + s`)
	- Add icon to existing node
	- change name of existing node (EXCEPT root node)
	
Some internal error and null pointer exception may appear when changing
map :
	- Always on first change (that will not be visible)
	- Never again 
(due to some freeplane magic, currently investigating it)

Currently 0 Unit tests are written, use at your own risks.
	
Link to jira Story (TA-38) : https://bugs.openflexo.org/browse/TA-38