* Show call decompilations under the opcode as a comment
* Rename RRegister as RReg
- Deprecate r_reg_init and use r_reg_new
- Rewrite the list.h dependency in r_reg in order to use r_list
- Fix some memory leaks
* Implement push/pop methods in RReg class
- add test case using it
- will be used for register diffing and tracing