Squashed commit of the following:

Remove sync receive
Disallow 2D effects on non-2D segments
Optimisations
Sync clarification
AR palettes
Return of 2 audio simulations
Bugfix in sync #3344
    - remove excessive segments
    - ignore inactive segments if not syncing bounds
    - send UDP/WS on segment change
    - pop_back() when removing last segment
Add pairing support for ESP-NOW sync
Reduce string RAM footprint
UDP parse optimisation
Make WizMote work with sync.
ESP-NOW wireless sync POC.
    - caveat: devices have to be on the same channel
    - clashes with WizMote handling ATM

wled00/led.cpp

@@ -226,7 +226,7 @@ void handleNightlight()
     if (!nightlightActiveOld) //init
     {
       nightlightStartTime = millis();
-      nightlightDelayMs = (int)(nightlightDelayMins*60000);
+      nightlightDelayMs = (unsigned)(nightlightDelayMins*60000);
       nightlightActiveOld = true;
       briNlT = bri;
       for (byte i=0; i<4; i++) colNlT[i] = col[i]; // remember starting color