sprite list clone and delete buttons do not respect multi-selection

[torzod]

sprite list entries can be multi-selected, but the clone and delete buttons, when pressed while multiple entries are selected, only applies to the most-recently-selected entry, making bulk operations much more tedious.

[torzod]

this also applies to the lunar magic sprite display list.

[Atari2]

multi-selection is tricky, i have a question on expected behavior:

• when cloning a multi selection rows, would you prefer all clones to be made under their respective original row (e.g. 123 cloned would be 112233), or all appended at the end (e.g. 123 cloned would end up 123123).

additionally, while implementing the multi-selection handling for the collections table view is easy, for the lunar magic displays it is rather complicated, because there is a lot of interleaved state which is long to decouple, so I was debating turning off multi-select entirely, is that a deal breaker feature?

[torzod]

i would prefer cloning 123 to result in 123123, and no, it would not be a deal-breaker, it is very easy to duplicate them by editing the json in a text editor.

[Atari2]

I implemented the multi-selection handling for the collections table view, however, for the lunar magic displays I turned off multi-selection entirely because it would be difficult, in the way it is currently coded, to handle correctly multi selection there, maybe it can be expanded upon in the future