upgrade to FastLED 3.6.0

changes from 3.50 to 3.6.0:
* bugfixes
* removed "register" keyword
* some speedups
* explicit bool() and uint32_t() operators, see FastLED/FastLED#819

FX.cpp:  bugfix for "wled00/FX.cpp:4906:36:
error: cannot convert 'CRGB' to 'uint32_t' {aka 'unsigned int'} in initialization"

platformio.ini

@@ -175,7 +175,7 @@ upload_speed = 115200
 # ------------------------------------------------------------------------------
 lib_compat_mode = strict
 lib_deps =
-    fastled/FastLED @ 3.5.0
+    fastled/FastLED @ 3.6.0
     IRremoteESP8266 @ 2.8.2
     makuna/NeoPixelBus @ 2.7.5
     https://github.com/Aircoookie/ESPAsyncWebServer.git @ ~2.0.7
@@ -201,7 +201,7 @@ build_flags =
   -DESP8266
   -DFP_IN_IROM
   ;-Wno-deprecated-declarations
-  -Wno-register  ;; leaves some warnings when compiling C files: command-line option '-Wno-register' is valid for C++/ObjC++ but not for C
+  ;-Wno-register  ;; leaves some warnings when compiling C files: command-line option '-Wno-register' is valid for C++/ObjC++ but not for C
   ;-Dregister= # remove warnings in C++17 due to use of deprecated register keyword by the FastLED library ;; warning: this can be dangerous
   -Wno-misleading-indentation
   ; NONOSDK22x_190703 = 2.2.2-dev(38a443e)

wled00/FX.cpp

@@ -4903,7 +4903,7 @@ uint16_t mode_2Dgameoflife(void) { // Written by Ewoud Wijma, inspired by https:
     } // i,j
 
     // Rules of Life
-    uint32_t col = prevLeds[XY(x,y)];
+    uint32_t col = uint32_t(prevLeds[XY(x,y)]) & 0x00FFFFFF;  // uint32_t operator returns RGBA, we want RGBW -> cut off "alpha" byte
     uint32_t bgc = RGBW32(backgroundColor.r, backgroundColor.g, backgroundColor.b, 0);
     if      ((col != bgc) && (neighbors <  2)) SEGMENT.setPixelColorXY(x,y, bgc); // Loneliness
     else if ((col != bgc) && (neighbors >  3)) SEGMENT.setPixelColorXY(x,y, bgc); // Overpopulation