Moved around more code. Implemented more sqlc. Added support to generate swagger.

Added support for profiling. Removed the pkg module altogether.
Everything except old sync is now using code generated by sqlc.

internal/db/migrations/000002_adjust_fields_for_sqlc.up.sql

@@ -0,0 +1,19 @@
+BEGIN;
+UPDATE game
+SET number_of_songs = 0
+WHERE number_of_songs IS NULL;
+UPDATE game
+SET hash = ''
+WHERE hash IS NULL;
+UPDATE song
+SET hash = ''
+WHERE hash IS NULL;
+COMMIT;
+BEGIN;
+Alter table game
+alter column number_of_songs set not null,
+alter column number_of_songs set default 0,
+ALTER COLUMN hash SET NOT NULL;
+ALTER TABLE song
+ALTER COLUMN hash SET NOT NULL;
+COMMIT;