Restructure data layer (#2532)

* Add new txn manager interface
* Add txn management to sqlite
* Rename get to getByID
* Add contexts to repository methods
* Update query builders
* Add context to reader writer interfaces
* Use repository in resolver
* Tighten interfaces
* Tighten interfaces in dlna
* Tighten interfaces in match package
* Tighten interfaces in scraper package
* Tighten interfaces in scan code
* Tighten interfaces on autotag package
* Remove ReaderWriter usage
* Merge database package into sqlite

pkg/sqlite/migrations/31_scenes_captions.up.sql

@@ -0,0 +1,8 @@
+CREATE TABLE `scene_captions` (
+  `scene_id` integer,
+  `language_code` varchar(255) NOT NULL,
+  `filename` varchar(255) NOT NULL,
+  `caption_type` varchar(255) NOT NULL,
+  primary key (`scene_id`, `language_code`, `caption_type`),
+  foreign key(`scene_id`) references `scenes`(`id`) on delete CASCADE
+);