add folding markers for @doc, @moduledoc, #region

[lastobelus]

No description provided.

[lastobelus]

See #156

[lastobelus]

It would probably be better if @doc and @moduledoc got the textmate scope comment.block in addition to comment.documentation, then I believe the built in folding of block comments, with the special Fold all block comments command would work.

[axelson]

Thanks ❤️ , just added typedoc support as well

[axelson]

And feel free to open another PR that changes/adds comment.block for type/module/docs

[jbosse]

The doc folding seems to work, however I cannot seem to get a region to fold.

# region
def my_method do
  #...
end

def my_other_method do
  #...
end
# endregion

@lastobelus This is how it is supposed to be marked, correct?