* Schemas : Added data types & webservice for schema texts
* Schemas : webservices and datatypes for Schema texts
* Schemas : text overlays are now editable and movable. Sharable too.
* Schemas : added possibility to delete text overlays
* Schemas : texts are now working on web version
* Schemas : added possibility to create text overlays
* Schemas : texts improved, added to state, however memento disabled as
* buggy
* Schemas : text overlays pointer events disabled when drawing
* Schemas : corrected bug (long delay between mousedown and first
* mousemove)
* Schemas : added color picker image
* Schemas : a little refactoring, and improvements
* Schemas : text overlays now have a small background to see them on dark
* Schemas : bugfix on text creation
Merge branch 'Features/schemas' into develop