Hi all!

This patch tweaks the forward-sentence function to be usable with
tree-sitter.

It follows the same style as the recent change in transpose-sexps, so I
hope it isn't too controversial.

What exact node types do you consider useful for sentence movement?

I added an example value in java-ts-mode and c-ts-mode, but that is
merely a suggestion.  Let's decide on some heuristic to decide the
proper nodes to use.

What do you think?

Theo