Adds some transformations actions.
Adds TransformationsWidget.
Merge pull request #805 from RotaruDan/transformationsWidget

Transformations widget
Minor fix
Merge pull request #806 from gorco/newInterface

Minor fix in MultiHorizontalToolbar
Improves erasing and reduces MeshHelper code.
Merge pull request #807 from RotaruDan/transformationsWidget

Improves erasing and reduces MeshHelper code.
Don't copy to project if the path already starts with the loading path.
Now images can be edited. Fixes some MeshHelper bugs.
Adds transparency when drawing elements.
Improves MeshHelper responsivity.
Merge pull request #808 from RotaruDan/editImages

Adds the posibility to draw/edit existing images.