[Dev/Frontend] PLATFORM CHANGES: use data-value instead of css class selection

WTD-1341
(cherry picked from commit 5151637 in warp1341)
telemetry.html now uses data-value instead of class;
Mods to effects.scss to add customKeyframes mixin;
Added default transition time to mixin trans-prop-nice in mixins.scss;

platform/commonUI/general/res/sass/_mixins.scss

@@ -26,7 +26,7 @@
     width: auto; height: auto;
 }
 
-@mixin trans-prop-nice($props, $t) {
+@mixin trans-prop-nice($props, $t: 500ms) {
 	@if $t == 0 {
 		@include transition-property(none);
 	} @else {