app: Rename app/core GimpVectors vectors API...

...to path.
Changes the names of
gimp_vectors_* () API to
gimp_path[s]_* (). Renames related files
to [path] instead of [vectors], along with
relevant enums and functions.

plug-ins/script-fu/libscriptfu/script-fu-arg.c

@@ -277,10 +277,10 @@ script_fu_arg_add_argument (SFArg         *arg,
       break;
 
     case SF_VECTORS:
-      gimp_procedure_add_vectors_argument (procedure, name,
-                                           nick, arg->label,
-                                           TRUE,
-                                           G_PARAM_READWRITE);
+      gimp_procedure_add_path_argument (procedure, name,
+                                        nick, arg->label,
+                                        TRUE,
+                                        G_PARAM_READWRITE);
       break;
 
     case SF_DISPLAY: