Adds ajax actions for clipboard items
Adds ajax actions for clipboard items

If a clipboard item's parameters contain `className` and `actionName`, an AJAX proxy action is executed with those parameters and the marked object ids.

This spares us writing that as event listeners for the `clipboardAction` event.

Additional changes:

* Adds `removeArrayValue` function.
* Adds the list item parameters as a third parameter for the event listener on `clipboardAction`.

PhrozenByte/WCF2,ramiusGitHub/WCF,Morik/WCF,Morik/WCF,Cyperghost/WCF,cashcat/WCF-1,MeinAccount/WCF,ramiusGitHub/WCF,Morik/WCF,joshuaruesweg/WCF,PhrozenByte/WCF2,NBZ4live/WCF,WoltLab/WCF,Cyperghost/WCF,MenesesEvandro/WCF,SoftCreatR/WCF,0xLeon/WCF,0xLeon/WCF,MenesesEvandro/WCF,SoftCreatR/WCF,joshuaruesweg/WCF,SoftCreatR/WCF,Cyperghost/WCF,Morik/WCF,NBZ4live/WCF,Cyperghost/WCF,joshuaruesweg/WCF,WoltLab/WCF,Cyperghost/WCF,WoltLab/WCF,MeinAccount/WCF,0xLeon/WCF,SoftCreatR/WCF,cashcat/WCF-1,WoltLab/WCF