So the huge update is coming...

What is it about:
* No more those circle menus (a.k.a. RadialMenu and co.)
* New cool Drag'n'Drop framework (attention, lots of lines in "def.statix.utils.drag" package)
* Toolbox on the left side (thanks for the framework above)
* Amazing flexible Editors Framework (you can find it in "def.statix.utils.ui.editors" package)
* Few renamings to get more clarity
* ConstructionUnit is abstract now (so no more creating throw it's constructors)
* ConstructionUnitBuilder method "createNewUnit()" becomes an abstract too (so all Builders now should creating unit of appropriate types by themselves)
* Added PlankType enum and one type inside: PLANK (so it can be recognized wherever it needs to be like other units)
* Litle useful class MathUtils with immortal function found while exploring Unity :D
* And of course some little unnoticeable fixes and refactoring :D

I hope that's all and nothing was missed. Be careful if merging occurs ;) Enjoy