Misc fixes and improvements

[list] [b]Fixes[/b] [*] Falling through floor fix (please report if still happening) [*] Prevent key from falling through map (Forge lava pit for example) [*] Ranged attack kills achievement fix [*] Physics interactions should be more stable than previously with low end PC specs [b]Improvements[/b] [*] Mouse thumb keys support for rebind [*] Invert camera X option added [*] Player HUD visibility options added [*] Brightness slider added [*] Adjusted Steadfast Warden attack animations [*] Adjusted font sizes in some UI elements [/list] Thanks to everyone that helped report and track bugs that we're present in the game, it's a huge help for us.