Basic cargo logistics with base creation and upgrading

[bitbubbler]

This pr introduces basic logistics with a framework for a more complex base building and upgrading system.

It also lays the foundation for other types of cargo to spawn units.

not implemented:

• units at bases (there are units in the base templates, they will eventually enable rearming and re-fueling)
• CA units and troops (this pr only implements base cargo, but includes a framework for units and troops)
• limiting cargo pickups to on the ground and near bases (including other conditions like only loading troops at farps