Added hook when a player is starting to paste

This hook gives the possibility to get the pasting player and the entity list on a very easy way.
This hook fits perfectly to the already existing hook, when a player finished to paste a dupe.

I'm open for any suggestions or changes!

Thanks
You're already running this hook in `AdvDupe.StartPaste`, no need to run it twice. Erase it from `AdvDupe.OverTimePasteStart`