Implement database versioning and migrations

[pacampbell]

Added support for fluentmigrator and translated the project schema file into a migration file. Added support for SQLite, MariaDB and Postgres. When the server first runs, it will check to see if any migrations are required and applies them.

Added a new command 'dbmigration' to the cli tool. This can be used to downgrade or upgrade the database without directly starting the server.

Attempts to address #93 and #102.

Checklist:

• [x] The project compiles
• [x] The PR targets develop branch

[pacampbell]

Closing this PR and deferring to #369