settings: Add setting to control NSO dumping

Also adds UI option in Debug > Dump section, with the idea later things to be dumped (i.e. other game data or textures, etc) will use the same group box.

src/core/settings.h

@@ -157,6 +157,7 @@ struct Values {
     bool use_gdbstub;
     u16 gdbstub_port;
     std::string program_args;
+    bool dump_nso;
 
     // WebService
     bool enable_telemetry;