[rpcsx-os/orbis-kernel] random bugfixes

ipmi: fixed respond sync, get message, try get message, try send message
event: detach event emitter from file
signals: basic implementation
linker: fixed zero symbol relocation, fixed exec relocation
shared_cv/mutex: implement eintr response support
shared_cv: fixed possible loop instead of wait
ipmi: implement invoke async, respond async, get result, get client app id, client get name
rpcsx-os: add safemode flag

orbis-kernel/include/orbis/thread/RegisterId.hpp

@@ -19,5 +19,6 @@ enum class RegisterId {
   rax,
   rsp,
   rflags,
+  rip,
 };
 } // namespace orbis