[FEATURE] Implement Delete From Server

[anasilva105]

It should only be made available on single and multiple metadata items but NOT on type folders.

If a folder is among the selected, the option should not appear / work for security reasons.
If multiple types were selected it should iterate over these internally.

Before actually deleting, the user should be asked to confirm that they actually want the LISTED and PRESELECTED items to be deleted
items should be presented in the multi-select as <type>: <key>