Add YAML Controller with File Management Functions

[benrobson]

It would be helpful to add a YAML controller to the library that allows for creating and managing YAML files easily as I've been writing plugins that have been refactoring away from MySQL and to YAML-based files for player data.

• Create a YAMLController class or module
• Ability to create a new YAML file if it doesn't exist
• Ability to read data from a YAML file using getYAMLData()
• Ability to write/update data in a YAML file using setYAMLData()