feat(db): add diesel and sqlite3 as dependencies

migrations/2021-03-02-022949_create_game_file_table/down.sql

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+-- This file should undo anything in `up.sql`
+DROP TABLE game_file

migrations/2021-03-02-022949_create_game_file_table/up.sql

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+-- Your SQL goes here
+CREATE TABLE game_file (
+    id INTEGER PRIMARY KEY,
+    original_path BLOB NOT NULL, -- TEXT assumes a Unicode Encoding
+    file_hash INTEGER NOT NULL, -- u64, but that's not
+    game_save_id INTEGER NOT NULL,
+    FOREIGN KEY (game_save_id) REFERENCES game_save_location (id)
+)