Add groups queries

src/db.h

@@ -27,6 +27,8 @@ enum query_type {
   Q_BROWSE_GENRES    = Q_F_BROWSE | (1 << 5),
   Q_BROWSE_COMPOSERS = Q_F_BROWSE | (1 << 6),
   Q_GROUPS           = (1 << 7),
+  Q_GROUPITEMS       = (1 << 8),
+  Q_GROUP_DIRS       = Q_F_BROWSE | (1 << 9),
 };
 
 struct query_params {
@@ -381,6 +383,9 @@ db_pl_enable_bycookie(uint32_t cookie, char *path);
 int
 db_groups_clear(void);
 
+enum group_type
+db_group_type_byid(int id);
+
 /* Remotes */
 int
 db_pairing_add(struct pairing_info *pi);