[Frontend] Added local zoom/reset controls

WTD-1222
Refactored scss in plots-main slightly;
Removed unused sass/plots.scss;

platform/features/plot/res/templates/plot.html

@@ -87,10 +87,10 @@
                 </mct-chart>
 
                 <!-- TODO: Move into correct position; make part of group; infer from set of actions -->
-                <div class="gl-plot-local-controls"
+                <div class="l-local-controls gl-plot-local-controls"
                      ng-if="$first"
                      ng-show="representation.showControls"
-                     style="position: absolute; top: 8px; right: 8px;">
+                    >
 
                     <a href=""
                        class="t-btn l-btn s-btn s-icon-btn s-very-subtle"