Directory Service is now added via Service Manager instead XRE_InitEmbedding.
Removed unused units from uses clause.
Clean shutdown if XRE Engine is not loaded.
Message in the GeckoBrowser if initialization failed.
git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1391 8e941d3f-bd1b-0410-a28a-d453659cc2b4