* Support more output modes for class inheritence graph.
* Refactor codexrefs and importxrefs graphs.
* Add ag_w for the commands using new mechanism.
* Separate drawable graph from r_graph.
* add `acg` - printing class hierarchy graph
* Move the printing into the cmd_anal.c from returned RAGraph
* Change API to return Graph and transform it to AGraph when printing is necessary
* Move graph to agraph into agraph module, move generic node structure to rgraph, removing unnecessary dependency
* Move RGraphNodeInfo related functions to graph.c
- add support for arm/arm64
- simplify the heuristics for carving the start of vtables in data const section to not rely on xrefs, instead look for mandatory vtable fields (only for itanium ABI)
- add support for classes recovery from itanium RTTI
- add class name demangling for itanium RTTI
- relax the requirements for detecting the typeinfo flavor, in absence of flags just assume the simplest kind so at least the class name is there
- expose more info from RTTI structures
- use PJ for printing json
