[Frontend] Refinements to Inspector elements, search inputs

open #199
open #279
Treeview indent removed;
Significant refactoring of search classes to generalize
approach to search inputs;

platform/commonUI/general/res/templates/controls/input-filter.html

@@ -20,15 +20,13 @@
  at runtime from the About dialog for additional information.
 -->
 <!-- look at action-button for example -->
-<span class="t-filter l-filter"
+<span class="t-filter l-filter s-filter"
       ng-controller="GetterSetterController">
 	<input type="search"
            class="t-filter-input"
-           ng-model="getterSetter.value"
-           placeholder="Filter..."/>
-	<a class="ui-symbol t-a-clear s-a-clear"
-       ng-show="getterSetter.value !== ''"
+           ng-model="getterSetter.value"/>
+	<a class="clear-icon"
+       ng-class="{show: !(getterSetter.value === '' || getterSetter.value === undefined)}"
        ng-click="getterSetter.value = ''">
-        x
     </a>
 </span>