Xnamespace: add basic namespace config structures

Adding data structure and initial data for namespace configuration.

Built-in namespaces are ROOT and ANONYMOUS.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>

include/privates.h

@@ -51,6 +51,7 @@ typedef enum {
     PRIVATE_GLYPHSET,
     PRIVATE_PICTURE,
     PRIVATE_SYNC_FENCE,
+    PRIVATE_NAMESPACE,
 
     /* last private type */
     PRIVATE_LAST,