Add Calling Convention Support

[RadWolfie]

After attempting to fully implement extend information for ghidra-xbe plugin, I discovered that ghidra-xbe doesn't include the calling convention method. And attempting to implement from ghidra-xbe's side isn't going to work due to the difference of thiscall and fastcall. While it may be possible to check the parameter's names. But it may be a little bit too much effort and unreliable as well. Since pull request #208 is the starting point of extending information support. There will be another pull request needed to implement this feature.

[RadWolfie]

Included in #208 pull request