Added Thumbnails and saving those to db,

also added Log for Locking and unlocking Rw, because there was a Problem with that, and now it stays

internal/database/createDb.sql

@@ -1,7 +1,8 @@
 create table if not exists Manga (
     ID integer not null primary key,
     Title text,
-    TimeStampUnixEpoch int
+    TimeStampUnixEpoch int,
+    Thumbnail blob
 );
 
 create table if not exists Chapter (