Arsenal: Camera mouse movement is inverted

[bux]

Based on commit: f13d0ebc5ba17502a689c2b6af9444bd10f1d2f9

Might be intentional

• Open Arsenal
• Move the camera using mouse dragging
• Dragging the mouse to the left makes the camera move to the left and vice versa
• Dragging the mouse to the bottom makes the camera move to the bottom and vice versa

Then

• Open vanilla Arsenal
• Move the camera using mouse dragging
• Dragging the mouse to the left makes the camera move to the RIGHT and vice versa
• Dragging the mouse to the bottom makes the camera move to the TOP and vice versa (this feels a bit more natural)

[bux]

Maybe make the inverted controls the default?

[alganthe]

done