[TxMt] Bundle Editor oddities

[Gerd Knops]

Probably all known, but just in case:

- Disabled item can no longer be selected, so it can't be re-enabled...

- If Grammar A includes Grammar B, and both bundles define a folding setting with the same scope selector, B's folding rules are picked up. I had expected that to be A's folding rules, so it is easier to overwrite a stock bundle's rules without having to modify the stock bundle itself by disabling the folding setting.

- Support files can't be edited in the bundle editor.

Gerd