Made ProductionAirdrop do all of its production logic by itself again. (+6 squashed commit)

Squashed commit:

[b38fc9a] ProductionAirdrop now passes a CPos instead of a Rallypoint to UnloadCargo.

[9d63423] Fix: Aircraft can now be produced by AirdropProduction.

[59c86d5] Fix rallypoint not working when using ProductionAirdrop.

[2aa4e8c] Changed how production works so you can now queue multiple actors to produce with one function (required for bulk production)

[59c86d5] Fix rallypoint not working when using ProductionAirdrop.

[2aa4e8c] Changed how production works so you can now queue multiple actors to produce with one function (required for bulk production)