Layers list: refresh button and search field

[dr-mohamed-benkhalifa]

The layers menu at the left of the Map must have a search-input and a reload button:

<!-- Header for Layers --> <md-toolbar class="md-theme-indigo"> <div layout="row" layout-align="center center"> <span class="md-toolbar-tools" flex>{{ getText('MAP_LAYERS') }}</span> </div> </md-toolbar>