Add ability to select default database connection

[crynobone]

• Allow selecting sqlite, mysql or pgsql driver using Laravel Prompts
• Default to mysql if accessed via --no-interaction.
• Update DB_CONNECTION to the correct database driver. (SQLite database doesn't update .env.example)
• Comment other DB_* variables when using sqlite.
• Update DB_PORT value based on selected database driver.

[taylorotwell]

Wouldn't you typically change the port on Postgres?

[crynobone]

Wouldn't you typically change the port on Postgres?

Added script to change default port, and allow selecting MSSQL