Reorganized SQL Scripts used for database schema installation on first dev setup

[Psypher9]

Objective:

Reorganize SQL schema and data scripts as per #193

Database script updates:

• Organized the single files rift.sql and rift_core.sql into hierarchical directories and files for better readability

  
  db
  -- rift
  ---- data
  ---- tables

-- rift_core ---- data ---- tables

- Reorganized the `setup.sql` restore and installation script to target schema scaffolding and data import per database
- Added `IF NOT EXISTS` on database creation and default user creation

## Dev Install Updates:
- Added attempts to start MySQL or MariaDB if already installed
- Successful scaffolding message after all databases have been built and their data imported
- Handle calling the `setup.sql` file for each step of the database creation

## Other changes:
- Modified .gitignore to allow `./db/rift/**` to be tracked but still ignore the build artifacts in the `./rift/` directory
- Added database PR labels

[Psypher9]

@rezalas, absolutely! This one was fun and I learned a lot about the nuances of the MySQL source command.