Clean many labels of scripts of gyms

[kqesar]

I have cleaned many labels and associated textPointer in the same ways that scripts/VermilionGym.asm and text/VermilionGym.asm

Related to issue #315

[Rangi42]

@dannye Please squash this if you're merging it so it becomes one commit.

[kqesar]

@Rangi42 I have squashed commit, now the PR have only one commit.

[dannye]

@dannye Please squash this if you're merging it so it becomes one commit.

@Rangi42 The commit log has always been a bit of a dogpile, so it doesn't seem super useful to start clean squashed merges now, but of course I agree with you in general.
Squashed or not, I at least like to merge rather than rebase to avoid invalidating the requester's branch.
I prefer it best when the requester pre-squashes (like KqesaR has already kindly done) but at the same time I don't like to always demand that the requester do this to avoid raising the barrier for entry, especially given that this isn't a particularly professional project. I'd like to hear your thoughts on my thoughts though.

[dannye]

@kqesar Thanks!