[Frontend] Layout and positioning fixes for TC controls

open #889
IN PROGRESS
- Smaller font used on range value;
- More space allocated to left and right
for slider range values;
- Style tweaks to slider look;
- Layout and style of datetime inputs
fixed;
- Input error colors fixed, moved to
theme constants;

platform/commonUI/themes/snow/res/sass/_constants.scss

@@ -36,7 +36,7 @@ $sliderColorKnob: rgba($sliderColorBase, 0.5);
 $sliderColorKnobHov: rgba($sliderColorBase, 0.7);
 $sliderColorRangeValHovBg: $sliderColorRange; //rgba($sliderColorBase, 0.1);
 $sliderColorRangeValHovFg: $colorBodyFg;
-$sliderKnobW: 5px; //nth($ueTimeControlH,2)/2;
+$sliderKnobW: 10px;
 $sliderKnobR: 2px;
 $timeControllerToiLineColor: $colorBodyFg;
 $timeControllerToiLineColorHov: #0052b5;
@@ -70,8 +70,10 @@ $colorCreateMenuText: $colorBodyFg;
 $colorCheck: $colorKey;
 $colorFormRequired: $colorKey;
 $colorFormValid: #33cc33;
-$colorFormError: #cc0000;
+$colorFormError: #990000;
 $colorFormInvalid: #ff2200;
+$colorFormFieldErrorBg: $colorFormError;
+$colorFormFieldErrorFg: rgba(#fff, 0.6);
 $colorFormLines: rgba(#000, 0.1);
 $colorFormSectionHeader: rgba(#000, 0.05);
 $colorInputBg: $colorGenBg;