Add deliver and retrieve package conditions to train schedules #8984
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This is a quick, slightly messy fix for #7598.
It changes how the station pushes packages to the trains cargo. Two new schedule conditions have been added "Retrieve Package" and "Deliver Package".
If the train is utilizing a schedule (e.g: not player controlled), when it stops at a station packages will not be automatically taken from the postboxes. This will only happen if "Fetch Package" destination instruction is used, or if the current destination entry has the new condition "Retrieve Package". In either case the filter is respected so it will not transfer packages to the train that do not match. Multiple "Retrieve Package" conditions can be used to stack package filters, in case * is too extreme.
Similarly a "Deliver Package" condition has been added, and when a train stops at a destination, it will only off load packages if the condition is present, or if deliver package instruction was used.
If the train is player controlled, the original functionality is used, as in it will eat all packages and deliver matching packages.
This can probably be done more optimally, but I really wanted it fixed for my own use and figured there's no harm in sharing it.