Update 0.5.3

Improved combat impact: added highlights and pushback effects on hits. Added a list of possible improvements to the overclocking interface. Added localized keyboard settings (for AZERTY keyboards, for example). Added brightness, gamma, and contrast settings. Added hotkeys for zooming in and out (for users without a mouse). Added a toggle mode option for free look mode. Train speed can now be controlled with the forward/backward keys (W/S by default). Train cameras can be changed with the left/right (A/D) hotkeys. Skin can now be used as fuel (not very effective, though). Minor UI/QoL improvements.