[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/features/layout/res/templates/elements/telemetry.html

@@ -24,7 +24,8 @@
 	ng-style="{ background: ngModel.fill(), 'border-color': ngModel.stroke(), color: ngModel.color() }"
 	>
 	<span
-		class="l-elem l-value obj-val-format ovf-{{ngModel.value}}"
+		class="l-elem l-value l-obj-val-format"
+        data-value="{{ngModel.value}}"
 		ng-class="{ 'telem-only': !ngModel.element.titled }"
 		>
 	    {{ngModel.value}}