Updated MariaDB driver to 2.6.2.
Updated MMO Core to 2.6.2.0.
Updated TestNG to 7.3.0.

Minor code cleanup.

Now you can do:
git clone
mvnw clean install

It doesn't require to download and install Maven.

Fixed some JavaDocs.
Finalized classes' methods don't need to be final.

MariaDB Client from 2.5.3 to 2.6.0
MySQL Client 8.0.18 to 8.0.19
HikariCP 3.4.2 to 3.4.3

SLF4J from 1.7.25 to 1.7.30.
MariaDB connector from 2.4.0 to 2.5.3.
MySQL connector from 8.0.15 to 8.0.18.
HikariCP from 3.3.1 to 3.4.2.
DBCP2 from 2.6.0 to 2.7.0.
ViburDBCP from 22.2 to 25.0.
TestNG from 6.14.3 to 7.1.0.

Lowered HikariCP maximum lifetime value to ten minutes.

Added Vibur DBCP and Apache DBCP support.