adding hints for the compiler for optimization.
In case your custom build complains about "const", just remove the keyword. based on e82f38e277, but going further :-)
* "const" class functions : function does not modify any class attributes ( --> "this" becomes const)
* __attribute__((pure)) : function return value depends only on the parameters and/or global variables. The function does not modify any global or static variables.
* __attribute__((const)) : function only examines arguments (no globals), and has no effects except the return value. This slightly more strict than "pure"
* hot: tells the compiler "this functions is called very often"
* cold: the opposite of hot
Added option to send UDP notifications twice to increase reliability
Added a C64 color theme
Added clock options
Added 12 timezones
Merged Cronixie and useoverlay build options
Removed abbrev char[] from Timezone lib to save memory
Added setting to reverse/flip LEDs
Added long press random color button function
(this eases compilation since all libraries are included except the ESP8266 core and NeoPixelBus)
Disabled serial debug output of Alexa library, may be re-enabled in .h-Files ifneedbe
Added &SR= to set random hue
Added &ST= to manually set time without NTP
Secondary color buttons now functional
Shifted effect by 1, range is now 1-25
Effect 0 is now the default boot setting
Fixed preset function not calling GIO() in js, which caused a delayed action
