Werk #6509: Pasting with automatic text splitting in list of input elements

When a dialog is using a self extending list of input elements, like e.g. the host- and service input fields at the bottom of the "hosts & service parameters" rule editor, a text can be pasted into the last input field which is then split by ";" separators. Each of the resulting parts is then added to a dedicated input field. This is only active for the last (empty) input field.

This makes it a lot easier to populate such dialogs with a longer list of items.

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