Move the vector class to utils
Move everything else to gosu_gui
Create the Utils module
Set up the basic structure of the Core module
First steps in logic separation
The game class should be implemented by the gui/cli
Start from scratch with the gui
Revert "The game class should be implemented by the gui/cli"

This reverts commit f7b5cd503085893cec44e3c672a3c81007385416.
Make my mind, the game class cannot be in core
Add resources and settings from master
DRY the loading methods
Add the z ordering to gosu_gui
Give information about direction quotient in another way

It gets nasty when you have to take the direction quotient of a scene
from outside of Core.
First steps with the renderers
Add the rest of the filename in its the path
Remove old require from core
Fix resources because assets have to be searched one level higher
Add forgotten attribute readers
Move the class's 'end' where it should be
Align assignments