source tree cleanup

The lib/ directory was getting a bit out of hand, so this tries
to organize things a bit so it is easier going forward to locate
the code people want to patch.

lib/util/sp-selection.h

@@ -0,0 +1,52 @@
+/* sp-selection.h
+ *
+ * Copyright (C) 2016 Christian Hergert <chergert@redhat.com>
+ *
+ * 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 SP_SELECTION_H
+#define SP_SELECTION_H
+
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define SP_TYPE_SELECTION (sp_selection_get_type())
+
+G_DECLARE_FINAL_TYPE (SpSelection, sp_selection, SP, SELECTION, GObject)
+
+typedef void (*SpSelectionForeachFunc) (SpSelection *self,
+                                        gint64                 begin_time,
+                                        gint64                 end_time,
+                                        gpointer               user_data);
+
+gboolean     sp_selection_get_has_selection (SpSelection            *self);
+gboolean     sp_selection_contains          (SpSelection            *self,
+                                             gint64                  time_at);
+void         sp_selection_select_range      (SpSelection            *self,
+                                             gint64                  begin_time,
+                                             gint64                  end_time);
+void         sp_selection_unselect_range    (SpSelection            *self,
+                                             gint64                  begin,
+                                             gint64                  end);
+void         sp_selection_unselect_all      (SpSelection            *self);
+void         sp_selection_foreach           (SpSelection            *self,
+                                             SpSelectionForeachFunc  foreach_func,
+                                             gpointer                user_data);
+SpSelection *sp_selection_copy              (const SpSelection      *self);
+
+G_END_DECLS
+
+#endif /* SP_SELECTION_H */