[Next Stable Release] Further split user version and dev

[Kein]

It is obvious that 80%-90% of UE4SS downloads on github come from end-users redirected from modding resources, not devs. End-users dont need more than half of the functionality and resources that comes with current default UE4SS package. Ideally, it must be as sleek and minimal as possible while keeping all current/broad mod support relatively intact.

1. Remove all unnecessary supplementary files/configs that still ship with non-dev UE4SS:
- ue4ss\Default_UVTD_Configs
- ue4ss\Mods\mods.json (unused yet)
Fun fact, the current Vortex plugin(s) for UE4SS will complain if you remove any of the files they expect to be in the archive because they blindly assume everything is important. This approach only works if it is true and is being upheld by packaging.

2. Remove all non-essential mods
- ue4ss\Mods\Keybinds (dev resource)
- ue4ss\Mods\LineTraceMod (dev resource)
- ue4ss\Mods\SplitScreenMod (debatable, but also a dev resource)
All these mods mostly relevant to devs as an examples, while Keybinds should be deprecated, given the fact UE4SS GUI seems to be marching forward at fast pace I think it should be the way to use internal tools like dumpers. UE4SS needs as minimum amount default keys bound as possible, to avoid interfering with mods

3. Update default mods to reduce their persistence and presence as much as possible without sacrificing functionality
Ongoing, see #886

The general overarching idea is to keep user and dev release separate, while user release only packaging the ideal minimal set for full operation.

[UE4SS]

1. I don't think the inclusion of Default_UVTD_Configs was intentional.
2. mods.json should absolutely be removed if we haven't finished that feature before the next release.
   (Added to release procedure list, for maintainers it's available: at https://github.com/orgs/UE4SS-RE/projects/9)
3. We shouldn't fully remove the Keybinds mod. Sometimes you can't use the GUI.
   We should probably remove it from non-dev though.
4. Yes the LineTraceMod should be removed from non-dev, though @narknon has objected to this before.
5. Unsure myself about SplitScreenMod

[Kein]

We shouldn't fully remove the Keybinds mod. Sometimes you can't use the GUI.

That's fine, it is not relevant to end-users in 99% cases. Keybinds still will be part of dev package of UE4SS, which is what, in my opinion, UE4SS should promote for [mod] devs as their go-to package.