Updates in Build 1850

- support for up to 5 buttoned mouse
- extra mouse actions: sprint, flashlight

- allow  Enter  to be set as a key
- tool tips for confusing menu options

- option to toggle running
- option to disable zooming altogether for W S
- show the key configured to select the gun instead just numbers
- fixes for E1M1 (missing geometry, ZombieCow wouldn't escape)
- fix for placing tripmine on shield
- fix: don't draw the torchlight for turrets