BREAKING - analogWriteRange 8-bit default

Matching standard Arduino cores, make the default analogWrite() take
values from 0...255.  Users can always use the analogWriteRange() call
to change to a different setup.

Fixes esp8266#2895

Author: earlephilhower

cores/esp8266/Arduino.h

@@ -43,7 +43,7 @@ extern "C" {
 #define HIGH 0x1
 #define LOW  0x0
 
-#define PWMRANGE 1023
+#define PWMRANGE 255
 
 //GPIO FUNCTIONS
 #define INPUT             0x00