Add Config option to allow naturally generated Waystones to spawn as Sharestones instead.

[DSchaedler]

Incentivizes players to leave stones where they spawned. Educates players on the use of Sharestones. Prevents players from keeping villages to themselves. Allows exploration to be a group effort.

[BlayTheNinth]

Sharestones do not have an activation/discovery state as waystones do. Generating them would flood the list with a ton of sharestones and render it practically unusable. The only way to avoid that is to add an activation state, at which point they're back to just being waystones with special steps.