Add ESP32 touch sensors as button alternative (#1190)

* Add touch option to button handler

* Check if touch is pressed in setup

* Add TOUCHPIN build env and override example

Co-authored-by: Aircoookie <dev.aircoookie@gmail.com>

wled00/wled.cpp

@@ -250,8 +250,8 @@ void WLED::beginStrip()
 #endif
 
   // disable button if it is "pressed" unintentionally
-#ifdef BTNPIN
-  if (digitalRead(BTNPIN) == LOW)
+#if defined(BTNPIN) || defined(TOUCHPIN)
+  if (isButtonPressed())
     buttonEnabled = false;
 #else
   buttonEnabled = false;