da-live deletion guards

[chrischrischris]

1. Show how many files are about to be deleted: We can crawl the selected file/folder list and get a count to display to the user.
2. Prevent deletion of 10,000 files at once.
3. Do not allow user to delete non-draft content if they do not have write permissions to .trash - This might be problematic though, and require consumers with complicated access rights to have to also rights to the .trash dir

[kptdobe]

2. Prevent deletion of 10,000 files at once.

I am not sure who really needs to delete so many files. We might reduce this number to 50 for example with a message to contact the admin team.
A key shortcut could enable a force delete independent of the number of files (with a clear warning message).

3. Do not allow user to delete non-draft content if they do not have write permissions to .trash

Or users should always have permissions to move to .trash.