Resolve "Sync from kurisu"

Closes #33 (closed)

Todo list:

• rescan [URI]
• update [URI]
• password from lkt
• available feature for the table kara
• mthread update -> detach threads
• use mthread to download

inc/lektor/repo.h

@@ -3,6 +3,8 @@
 #include <lektor/defines.h>
 #include <lektor/mkv.h>
 #include <lektor/thread.h>
+#include <lektor/uri.h>
+
 #include <curl/curl.h>
 #include <sqlite3.h>
 #include <json.h>
@@ -36,3 +38,9 @@ int repo_download_id_sync(struct lkt_repo *const repo, sqlite3 *db, const uint64
                           const char *kara_path, struct kara_metadata *mdt_ret);
 int repo_download_id_async(const size_t id);
 int repo_get_kara_async(struct kara **downloaded);
+
+/* Scan and update the DB.
+   If only update from the kurisu repo, rescan must be null, if you want to
+   also scan the directories, set rescan to a non zero value. If the uri is
+   null, will just update/rescan everything. */
+int repo_sync(struct lkt_uri_t *uri, int rescan);