command outputs; ipc command output reception & writing to stdout

src/raddbg/raddbg_core.h

@@ -634,6 +634,8 @@ struct RD_State
   Arena *cmds_arenas[2];
   RD_CmdList cmds[2];
   U64 cmds_gen;
+  Arena *cmd_output_arena;
+  String8List cmd_outputs;
   
   // rjf: popup state
   UI_Key popup_key;