Updated the GUI and added the ability to increase the efficency up to 150% more for out-of-Earth-physics. For those who got errors about invalid Entities, this is hopefully fixed now for everyone.

Small typos ...

Added validation for entity on death.

Fixed hook.add(.. returning false (thanks to DBotThePhone for pointing it out). Added HUD displaying nil on reload/removing fin-property partially.

Forgot to add removal of HUD on reload.

Added support for viewing the current settings of a prop that uses Fin, when on focus.

Updated the description, added more pictures and linked a video of a finished "product" using the Fin 2 tool.