Update Favored terrain and other references to (premaster) Wild Stride

[dotadd]

Closes #16961

• Replace reference to (old) Wild Stride with Unimpeded Journey

Also:

• Add missing movement bonus effects to Favored Terrain
• Adjust these effects to remaster

[TikaelSol]

These are automatable now, so we should actually mothball the effects and probably move the automation to the feature itself.

[dotadd]

That sounds like a good idea. I'm just not clear on some of the details:

1. The terrain type should probably be a drop-down, because of things like Terrain Master being able to change it short-term, right? And a choice set would require removing and re-adding the feature.
2. How would we detect whether the actor is in that terrain? Just with toggle or anything more elaborate like regions?
3. Is ignoring difficult terrain from regions possibility?
4. I'm not sure how I would go about any part of this tbh: Arctic: You need to eat and drink only one-tenth as much as usual, you aren’t affected by severe or extreme cold, and you can walk across ice and snow at full Speed without needing to Balance.