Centered Crosshair

# Centered Crosshair Fixes the annoying bug where the center of the crosshair doesn't actually match the center of the screen. Example (Red Cross = Screen Center): Vanilla MinecraftWith the Mod If the crosshair is an uneven number of pixels wide (e.g. 3), it will still be offcenter but just by half a pixel. This also works with any crosshair-changing resource packs!