TUNIC: Logic for bushes in guard house 2 upper and belltower

[ScipioWright]

What is this fixing or adding?

I <3 bushes
Adds logic for breaking the bushes in guard house 2 upper. Only relevant with ladder shuffle or ER or whatever else uses the ER rules on.
Also forest belltower.

How was this tested?

Test gens.

[roseasromeo]

Added logic is in line with how the rando functions, new regions prevent soft-locking due to lack of access to bush-cutting.

[Seatori]

Tested in-game and verified that all of the listed methods were valid ways of reaching each entrance.
Also ran several test generations using plando to verify that each method was correctly registered, and viewed playthroughs in which each method was in play.
Lastly, I verified that the easy ice grappling method wasn't expected with ice grappling disabled by using plando to create an impossible seed without using Magic Orb + Magic Dagger on that entrance, seeing that it failed with ice grappling disabled, and that it succeeded when it was enabled on all three difficulty levels.