Alpha code additions

- Added a data class to store the plugin's config and data
- Added a helpers class to store all helpers I might need to add
- Added a helper to generate a glass wall
- Added MZMovement to handle the player movement events, making sure
players cannot exit from the borders of the zone
- Added MZRectangle to use as a rectangle class
- Added a method to MZRectangle to check if an x,z co-ord pair is inside
it
- Added MZRegen to handle the stopping of normal regen
- Added the base MinecraftZ class that handles the commands, and the
passing on of tasks to other classes
- Added gitignore to handle the .class files