Improve the settings management

[alexandremasy]

Implement a better way to manage the settings values

• Some will have multiple values;
• Some will have one value;

Give separation between the header of the data and the actual data.

//
//  @param {String} $key – The key to register
//  @param {*} $value – The value to register
//  @return * – The value stored for the key
//
@mixin config($key, $value: null){}