## Link to GitHub Issue or related Pull Request, if one exists
Related to #181
## Description of change
This PR removes two features marked as "experimental" for analog axis -
`Delay` and `Relative Axis`.
They have been in spice as experimental option for almost 2 years.. but
they have a fundamental problem of being tied to how often the analog is
polled. Not just how often the game's I/O emulation code polls it, but
literally any source (spice API, overlay, etc).
For `Delay`, the only real usage I'm aware of is for #181 which is
delaying IIDX turntable input. For this, I will follow up with a
separate PR that adds back the delay option specifically for IIDX.
For `Relative Axis` - I'm not quite sure if any one actually uses this.
This could be implemented per-game if some game demands it. Polaris
Chord already has one, for example.
## Testing
bicarusandGitHub
c5a4e954f9