Replaced strchr with nodeid_split

Experimental code for replacing identityref lists with module:id instead of prefix:id

lib/src/clixon_yang_internal.h

@@ -96,7 +96,8 @@ struct yang_stmt{
     cvec              *ys_cvec;      /* List of stmt-specific variables 
 					Y_RANGE: range_min, range_max 
 					Y_LIST: vector of keys
-					Y_TYPE & identity: store all derived types
+					Y_TYPE & identity: store all derived 
+					   types as <prefix>:<id> list
 				     */
     yang_type_cache   *ys_typecache; /* If ys_keyword==Y_TYPE, cache all typedef data except unions */
     int               _ys_vector_i;   /* internal use: yn_each */