feat: Implements auto-updating database table

- Automatically updates database table from old versions / Invitarr
 - Fancy text formatting to boost my ego
 - Removes synced variable from config, as we now sync always (guild-specific sync is automatic.)

task: gh-9

app/bot/helper/dbupdater.py

@@ -0,0 +1,65 @@
+import sqlite3
+
+CURRENT_VERSION = 'Membarr V1.1'
+
+table_history = {
+    'Invitarr V1.0': [
+        (0, 'id', 'INTEGER', 1, None, 1),
+        (1, 'discord_username', 'TEXT', 1, None, 0),
+        (2, 'email', 'TEXT', 1, None, 0)
+    ],
+    'Membarr V1.1': [
+        (0, 'id', 'INTEGER', 1, None, 1),
+        (1, 'discord_username', 'TEXT', 1, None, 0),
+        (2, 'email', 'TEXT', 0, None, 0),
+        (3, 'jellyfin_username', 'TEXT', 0, None, 0)
+    ]
+}
+
+def check_table_version(conn, tablename):
+    dbcur = conn.cursor()
+    dbcur.execute(f"PRAGMA table_info({tablename})")
+    table_format = dbcur.fetchall()
+    for app_version in table_history:
+        if table_history[app_version] == table_format:
+            return app_version
+    raise ValueError("Could not identify database table version.")
+
+def update_table(conn, tablename):
+    version = check_table_version(conn, tablename)
+    print('------')
+    print(f'DB table version: {version}')
+    if version == CURRENT_VERSION:
+        print('DB table up to date!')
+        print('------')
+        return
+
+    # Table NOT up to date.
+    # Update to Membarr V1.1 table
+    if version == 'Invitarr V1.0':
+        print("Upgrading DB table from Invitarr v1.0 to Membarr V1.1")
+        # Create temp table
+        conn.execute(
+        '''CREATE TABLE "membarr_temp_upgrade_table" (
+        "id"	INTEGER NOT NULL UNIQUE,
+        "discord_username"	TEXT NOT NULL UNIQUE,
+        "email"	TEXT,
+        "jellyfin_username" TEXT,
+        PRIMARY KEY("id" AUTOINCREMENT)
+        );''')
+        conn.execute(f'''
+        INSERT INTO membarr_temp_upgrade_table(id, discord_username, email)
+        SELECT id, discord_username, email
+        FROM {tablename};
+        ''')
+        conn.execute(f'''
+        DROP TABLE {tablename};
+        ''')
+        conn.execute(f'''
+        ALTER TABLE membarr_temp_upgrade_table RENAME TO {tablename}
+        ''')
+        conn.commit()
+        version = 'Membarr V1.1'
+
+    print('------')
+