a bunch of smaller speedups to core functions

*  make local functions "static"
* use fast_ int types where possible
* use native min/max instead of MIN/MAX macros. Macros evaluate each parameter TWICE!!
* adding __attribute__((pure)) and __attribute((const)) to help the compiler optimize
* ws.cpp: reduce max "live leds" in fastpath mode

wled00/led.cpp

@@ -293,7 +293,7 @@ void handleNightlight()
 }
 
 //utility for FastLED to use our custom timer
-uint32_t get_millisecond_timer()
+uint32_t __attribute__((pure)) get_millisecond_timer() // WLEDMM attribute pure = does not write other momory
 {
   return strip.now;
 }