* Some of the API replaced int with QKeyCombination, use typedef in
cutter code
* Use of + operator depracted, replace with recommended "|" operator
* QMouseEvent globalPos and localPos renamed to globalPosition and
position, replace with helper function or use of integer position which
wasn't renamed.
* Add generic r2 graph.
* Add Callgraph widgets
* Add more graphviz layouts.
* Fix some edge cases in graphGridLayout that were more likely to appear in callgraphs
* Refactor the code moving some of the logic out of disassemblyGraphWidget making it more reusable