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This changes the controls to be more similar to what you would see in most video games, i.e. the up-vector always points in the same direction, here in the +Y direction, and vertical mouse movement is inverted. Arrow keys move the camera only in the xz-plane, not up and down, and this change also necessitates the introduction of dedicated up and down controls, here using the spacebar and shift keys correspondingly.
This also adds WASD-controls as an alternative to the arrow keys.
This also adds the fix to the camera issue on Linux that @billsix presented in pull request #100