These classes do not (and should not) modify the input actions array. Use `ReadonlyArray` to enforce this

Needs to be revisited

- Updated @types/node
- Fix compilation under Electron 6

Includes:

- Fix to soft reset
- getCell typings fix
- Parser optimizations

Fixes #75021

Our incremental build missed these

Changes the `ZoneWidget` base class to use a readonly Disposable store instead of an array of disposables. Also fix two potential bugs in `_initSash`:

- `Sash` is disposable but was not registered as one
- Calling `_initSash` multile times would leak the old sash.

fixes #73781