message: Make the EntityTile chevron a masked SVG for theming
  Fixes
diff: @@ -22,10 +22,20 @@ limitations under the License.
  }
  .mx_EntityTile:hover {
  - background-image: url('$(res)/img/member_chevron.png');
  - background-position: center right 10px;
  - background-repeat: no-repeat;
  padding-right: 30px;
  + position: relative; // to keep the chevron aligned
  +}
  +
  +.mx_EntityTile:hover::before {
  + content: "";
  + position: absolute;
  + top: calc(50% - 8px); // center
  + right: 10px;
  + mask: url('$(res)/img/member_chevron.png');
  + mask-repeat: no-repeat;
  + width: 16px;
  + height: 16px;
  + background-color: $rightpanel-button-color;
  }
  .mx_EntityTile .mx_PresenceLabel {
  