Delay between pixels (#668)

* Delay inter pixel support

* s2 s3 c3 Bitbang

* deprecate NeoPixelBrightnessBus

src/internal/NeoEsp8266I2sMethodCore.cpp

@@ -25,6 +25,7 @@ License along with NeoPixel.  If not, see
 -------------------------------------------------------------------------*/
 
 #include <Arduino.h>
+#include "NeoUtil.h"
 #include "NeoEsp8266I2sMethodCore.h"
 
 #ifdef ARDUINO_ARCH_ESP8266