Add T16 support

Added support for:
- T16 radio
- internal multi-protocol module.
- flashing internal and external multi-protocol modules.

Many thx to:
- goebish, for the hardware support.
- qba667, for the original patches for the internal multi-protocol support (UI and serial com).

radio/src/gui/gui_common.cpp

@@ -567,6 +567,13 @@ bool isInternalModuleAvailable(int moduleType)
   if (moduleType == MODULE_TYPE_NONE)
     return true;
 
+#if defined(INTERNAL_MODULE_MULTI)
+  if (moduleType == MODULE_TYPE_MULTIMODULE)
+    return true;
+  else
+    return false;
+#endif
+
   if (moduleType == MODULE_TYPE_XJT_PXX1) {
 #if defined(PXX1) && defined(INTERNAL_MODULE_PXX1)
     return !isModuleUsingSport(EXTERNAL_MODULE, g_model.moduleData[EXTERNAL_MODULE].type);
@@ -584,7 +591,6 @@ bool isInternalModuleAvailable(int moduleType)
     return true;
 #endif
   }
-
   return false;
 }
 #endif