change chainbutton to index instead of color

src/buttons.cpp

@@ -63,6 +63,19 @@ bool buttonIsPressed(e_ledcolor index)
   }
 }
 
+bool buttonIsPressed(uint16_t index)
+{
+  c_button *thisbutton = getButton(index);
+  if (thisbutton == NULL)
+  {
+    return false;
+  }
+  else
+  {
+    return thisbutton->isPressed();
+  }
+}
+
 bool buttonWasPressed(e_ledcolor index)
 {
   c_button *thisbutton = getButton(index);