[#124] ARM: Make `imm` detail field signed.
Merge pull request #125 from parasyte/ticket-124

ARM: Make `imm` detail field signed.
python: ArmOpValue.imm uses int32 type after the last change in the core
Add `r0l` register to SystemZMapping.c
Merge pull request #127 from parasyte/bug/SystemZ/r0l-reg

Add `r0l` register to SystemZMapping.c