[all] Mixer bugs fixed (slow / delays)

[stock] Flash saving
[stock] PWM backlight fix
[stock] NAVIGATION=STICKS pulled from er9x, thanks Mike!
[Taranis] Telemetry logs in DEBUG mode correctly opened / closed (not tested)

src/keys.cpp

@@ -91,7 +91,7 @@ void Key::input(bool val, EnumKeys enuk)
       //fallthrough
     case KSTATE_START:
       putEvent(EVT_KEY_FIRST(enuk));
-      inacCounter = 0;
+      inactivity.counter = 0;
       m_state   = KSTATE_RPTDELAY;
       m_cnt     = 0;
       break;