qeditor: many enhancement

Qeditor has been improved in many ways:
- it can now dump all registers, just like the lua DUMPER.dump_all() command
- several crash were fixed
- when connected to a hwstub command, one can correctly edit individual fields
- the code was simplified in several places

Change-Id: I092b99ce3a12ff6417552de61d62c65f706bcff0
8 files changed