Switch db adapter from mysql2 to trilogy

[nimmolo]

Note

To get on trilogy, devs must log into mysql locally:

$ mysql -u root -p

and run the following command:

mysql> ALTER USER 'mo'@'localhost' IDENTIFIED WITH mysql_native_password BY 'mo';

[coveralls]

coverage: 94.421%. remained the same
when pulling 7a0bb27 on mysql2-to-trilogy
into b03354b on main.