Make rop dissassemble back from the end gadgets

- Remove some exta dissassembly steps too
- Fix up some rop search stuff
- constify is_end_gadget
- Comment the rop stuff
- Remove constant 60
- Rename rop config stuff
Add var renaming in webui and fix various bugs

- Fix missing spaces when show_functions and not in function
Fix some more disasm glitches
Refactor cmd_print_format into r_print_format

That enables nested specific fields access for reading and writing