CustomEffects as usermod: step 4: modify wledv123.json, add drawLine/Arc

General (for CE, but also used by M12_pArc)
- add drawArc

Custom Effects
- add WLEDSR Custom Effects comment to places in WLED where it is hooked in
- move from wled.json to wledv123.json
- rename matrixWidth/Heigth to width/height and use virtualWidth/Height
- remove setPixels
- add drawLine / drawArc

wled00/usermods_list.cpp

@@ -139,6 +139,7 @@
 #include "../usermods/audioreactive/audio_reactive.h"
 #endif
 
+//WLEDSR Custom Effects
 #ifdef USERMOD_CUSTOMEFFECTS
 #include "../usermods/customeffects/usermod_v2_customeffects.h"
 #endif
@@ -270,6 +271,7 @@ void registerUsermods()
   usermods.add(new AudioReactive());
   #endif
 
+  //WLEDSR Custom Effects
   #ifdef USERMOD_CUSTOMEFFECTS
   usermods.add(new CustomEffectsUserMod());
   #endif