GUACAMOLE-220: Add common directive for displaying the save/clone/cancel/delete buttons shared by all object management pages.

guacamole/src/main/webapp/app/manage/templates/managementButtons.html

@@ -0,0 +1,6 @@
+<div class="action-buttons">
+    <button ng-show="permissions.canSaveObject" ng-click="saveObject()">{{namespace + '.ACTION_SAVE' | translate}}</button>
+    <button ng-show="permissions.canCloneObject" ng-click="cloneObject()">{{namespace + '.ACTION_CLONE' | translate}}</button>
+    <button ng-click="cancel()">{{namespace + '.ACTION_CANCEL' | translate}}</button>
+    <button ng-show="permissions.canDeleteObject" ng-click="deleteObject()" class="danger">{{namespace + '.ACTION_DELETE' | translate}}</button>
+</div>