* Separate graph layout code from GraphView.
* Remove formatting and grid layout specific code from GraphLayout.
* Copy edge styles from from main graph view to overview.
Sometimes it is not necessary to include the whole Cutter.h file
Hence, it's been splitted so you can include only what you require
E.g. #include "core/CutterCommon.h" to have access to the common types
* Replace scroll algorithm with just using offset
* WIP
* Text is now shown properly on each node
* WIP
* Scaling well WIP
* Fix positioning for Graph
* Overview properly displays Rect WIP
* Rect in overview moves along with the mouse WIP
* Overview rect properly moves WIP
* mouse properly moves WIP
* in middle of fixing resizing WIP
* scaling issue WIP
* Properly zooms
* almost done
* Edge width fixed for the overview
* Fixed a small bug
* Clean up
