FoV and FoV Convert commands

[animafps]

Is your feature request related to a problem? Please describe.
In previous versions, there was a function to provide conversions from in-game FoV values to horizontal and vertical FoV values and to other in-game FoV values.

But there was a various set of issues which meant that it didn't always work correctly and the code was very confusing and use.

Describe the solution you'd like
Create a new command using the framework that I have already set up in https://github.com/animafps/fpsmath/blob/main/src/commands/Math/fov.ts and https://github.com/animafps/fpsmath/blob/main/src/commands/Math/fovConvert.ts

To reuse a lot of the code between the two functions/commands it may be useful to create a file in the helper's folder with functions that can be used

Describe alternatives you've considered
Implement the old code which is just too confusing and had too many flaws for the fovConvert command but could be implemented in the FoV command but because they are linked and the code was hard to understand it may be better to create the new one first and make sure there is no issues

Additional context
Old Versions: https://github.com/animafps/fpsmath/blob/984d3f3631f163f978d49dcc46401b0a1228e633/src/commands/math/fov.ts https://github.com/animafps/fpsmath/blob/984d3f3631f163f978d49dcc46401b0a1228e633/src/commands/math/fovConvert.ts
FILM Notation: https://www.kovaak.com/film-notation/

This will prob need to be planned a lot around the implementation and the math involved so use this thread and or the dev channel in the support Discord server