New endpoint for UI slider control (WLED-SR ext.)

Minor UX optimizations.

wled00/FX.h

@@ -932,7 +932,7 @@ class WS2812FX {
 const char JSON_mode_names[] PROGMEM = R"=====([
 "Solid",
 "Blink@;!;!",
-"Breathe@!,;,!;!",
+"Breathe@!,;!,!;!",
 "Wipe",
 "Wipe Random",
 "Random Colors",
@@ -940,12 +940,13 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Dynamic",
 "Colorloop",
 "Rainbow",
-"Scan@!,# of dots;,!,;!",
-"Scan Dual@!,# of dots;,!,;!",
-"Fade","Theater",
+"Scan@!,# of dots;!,!,;!",
+"Scan Dual@!,# of dots;!,!,;!",
+"Fade",
+"Theater",
 "Theater Rainbow",
 "Running@!,Wave width;!,!,;!",
-"Saw@!,Width;Fx,Bg,;!",
+"Saw@!,Width;!,!,;!",
 "Twinkle",
 "Dissolve",
 "Dissolve Rnd",
@@ -966,25 +967,25 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Colorful",
 "Traffic Light",
 "Sweep Random",
-"Running 2@!,Width;;!",
+"Running 2@!,Width;!,!,;!",
 "Aurora",
 "Stream",
 "Scanner",
 "Lighthouse",
 "Fireworks",
 "Rain",
-"Tetrix@!,Width;Fx,Bg,;!",
+"Tetrix@!,Width;!,!,;!",
 "Fire Flicker",
 "Gradient",
 "Loading",
 "Police@!,Width;;",
 "Police All@!,Width;;",
-"Two Dots@!,Dot size;,,Bg;!",
-"Two Areas@!,Size;,,Bg;!",
+"Two Dots@!,Dot size;1,2,Bg;!",
+"Two Areas@!,Size;1,2,Bg;!",
 "Running Dual",
 "Halloween",
-"Tri Chase@!,Size;;",
-"Tri Wipe",
+"Tri Chase@!,Size;1,2,3;",
+"Tri Wipe@!,Width;1,2,3;",
 "Tri Fade",
 "Lightning",
 "ICU",
@@ -993,9 +994,9 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Stream 2",
 "Oscillate",
 "Pride 2015",
-"Juggle@!,Trail;Fx,Bg,;!",
+"Juggle@!,Trail;!,!,;!",
 "Palette@!,;;!",
-"Fire 2012@Spark rate,Decay;!;!",
+"Fire 2012@Spark rate,Decay;;!",
 "Colorwaves",
 "Bpm",
 "Fill Noise",
@@ -1017,10 +1018,10 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Spots",
 "Spots Fade",
 "Glitter",
-"Candle@Flicker rate,Flicker intensity;Fx,Bg,;",
+"Candle@Flicker rate,Flicker intensity;!,!,;",
 "Fireworks Starburst",
 "Fireworks 1D@Gravity,Firing side;;!",
-"Bouncing Balls@Gravity,# of balls;Fx,Bg,;!",
+"Bouncing Balls@Gravity,# of balls;!,!,;!",
 "Sinelon",
 "Sinelon Dual",
 "Sinelon Rainbow",
@@ -1031,11 +1032,11 @@ const char JSON_mode_names[] PROGMEM = R"=====([
 "Ripple Rainbow",
 "Heartbeat",
 "Pacifica",
-"Candle Multi@Flicker rate,Flicker intensity;Fx,Bg,;",
+"Candle Multi@Flicker rate,Flicker intensity;!,!,;",
 "Solid Glitter",
-"Sunrise@Time [min],;!;",
+"Sunrise@Time [min],;;",
 "Phased",
-"Twinkleup@!,Intensity;,!;!",
+"Twinkleup@!,Intensity;!,!,;!",
 "Noise Pal",
 "Sine",
 "Phased Noise",