Switch startup, config, commands and db migrations to mautrix-go systems

database/legacymigrate.sql

@@ -0,0 +1,10 @@
+DROP TABLE version;
+CREATE TABLE version(version INTEGER PRIMARY KEY);
+INSERT INTO version VALUES (1);
+CREATE TABLE crypto_version (version INTEGER PRIMARY KEY);
+INSERT INTO crypto_version VALUES (6);
+CREATE TABLE mx_version (version INTEGER PRIMARY KEY);
+INSERT INTO mx_version VALUES (1);
+
+UPDATE "user" SET id=null WHERE id='';
+ALTER TABLE "user" ADD CONSTRAINT user_id_key UNIQUE (id);