Trashing files is often the only way a guest account can remove a file from a shared folder or drive

I needed this so others may also, also includes the ability to attempt to untrash files marked as trashed, and a switch to exclude trashed files from a file list, as the v2 List Files API could return trashed files and I could not confirm if this was still the case for the v3 API.

The effect of trashing or untrashing a directory is that it works recursively, so it's behind a recursing flag as with delete.

Also adds the Trashed related fields to Files Info <ID> if they exist, with Trashed only showing if it's true as it's always included in the retrieved info now.