app: move some stuff out of app/file/

file-procedure.[ch] is gone and its functions moved to
GimpPlugInManager where they belong (the manager keeps around the
lists of load, save and export procedures).

Utility functions from file-utils.[ch] that have nothing to do with
image files moved to core/gimp-utils.[ch].

app/plug-in/gimppluginmanager-file-procedure.h

@@ -0,0 +1,37 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimppluginmanager-file-procedure.h
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_PLUG_IN_MANAGER_FILE_PROCEDURE_H__
+#define __GIMP_PLUG_IN_MANAGER_FILE_PROCEDURE_H__
+
+
+
+GimpPlugInProcedure *file_procedure_find              (GSList      *procs,
+                                                       GFile       *file,
+                                                       GError     **error);
+GimpPlugInProcedure *file_procedure_find_by_prefix    (GSList      *procs,
+                                                       GFile       *file);
+GimpPlugInProcedure *file_procedure_find_by_extension (GSList      *procs,
+                                                       GFile       *file);
+
+GimpPlugInProcedure *file_procedure_find_by_mime_type (GSList      *procs,
+                                                       const gchar *mime_type);
+
+
+#endif /* __GIMP_PLUG_IN_MANAGER_FILE_PROCEDURE_H__ */