AOT compatibility enhancements (#2015)

* aot compatibility updates

- remove index files where needed
- move material dependencies to a separete module
- use aot compatible lambda functions for module export

* remove unused imports

* re-export Material module

* core module enhancements

- fix AOT issue with providers (use lambda instead of variable)
- move context menu to a separate module

* core module enhancements

* feature modules

ng2-components/ng2-alfresco-datatable/src/components/datatable/datatable-cell.component.ts

@@ -16,7 +16,7 @@
  */
 
 import { Component, Input, ChangeDetectionStrategy } from '@angular/core';
-import { DataTableAdapter, DataColumn, DataRow } from '../../data/index';
+import { DataTableAdapter, DataColumn, DataRow } from '../../data/datatable-adapter';
 
 @Component({
     selector: 'alfresco-datatable-cell',