toolbar preparation
add toolbar conf in settings
additional color picker field
change slider height to relative values
improve firefox UI appearance
implement all settings setters
implement OTA lock / security
implement button
implement HSB slider option
change color submit from get to post, rewrite with args, requires no buffer
change color submit from rgb to hex
svg icons in html
(get rid of spiffs, use progmem for html??)

BUGS
static ip disables mdns
XXX authentification for security relevant areas (/edit, /update (!!!), /list, /down, [/settings, /reset, /cleareeprom])