Local debugger fixes and extensions

- Adds q/quit option to console debugging
- Adds options (variable_prefix)
- Breaks into debugger with Ctrl-C in local debug mode (Unix/Windows)
- Added option to list all breakpoints
- Fixes add/remove breakpoint bug (invalid path parsing)
- Minor cleanup

main/main.cpp

@@ -730,6 +730,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 	} else if (debug_mode == "local") {
 
 		script_debugger = memnew(ScriptDebuggerLocal);
+		OS::get_singleton()->initialize_debugging();
 	}
 
 	FileAccessNetwork::configure();