Moved IsValid check to fix null clientside entity error

Display lift/drag vectors in the proper position on primitive airfoils

- Optimized networking
- Slight refactor to fin class definition to be more proper
- Induced drag is now a slider from 0-1 rather than a boolean value
- Fix to allow use on primitives

Display a warning if looking at an entity with Fin 2 still applied

Minor optimizations, up/forward axis calculations now fully serverside

Rework fin creation to make it easier to define forward vector

Make direction indicator lines a bit cleaner when ent already has fin

Add zero lift angle to values to copy when right clicking with tool

Enable induced drag for old version fins, brighten dark colors

Fixed non-cambered fins displaying zero lift angle