[Frontend] Migrated to s-status-editing

open #199
open #278
Changed CSS to use s-status-editing instead of .active
class;
Refined style defs to explicitly target tree and
search-results children in order to avoid items in
Inspector Elements pool from being designated as
being edited;
Removed {{searchText}} div from input-filter;

platform/commonUI/general/res/sass/user-environ/_layout.scss

@@ -295,7 +295,7 @@
 
     .left {
         padding-right: $interiorMarginLg;
-        .l-back {
+        .l-back:not(.s-status-editing) {
             margin-right: $interiorMarginLg;
         }
     }