[sky9x + gruvin9x] Remanent timers

[sky9x] Timer since last charge
[sky9x] Massstorage (not working at this moment)
[sky9x] Debug Thread
[stock] Flash saving

src/eeprom_avr.cpp

@@ -870,6 +870,14 @@ void eeLoadModel(uint8_t id)
 
     resetProto();
     resetAll();
+
+#if defined(PCBV4)
+    for (uint8_t i=0; i<MAX_TIMERS; i++) {
+      if (g_model.timersXtra[i].remanent) {
+        s_timerVal[i] = g_model.timersXtra[i].value;
+      }
+    }
+#endif
   }
 }