Fix for overhauling to storage buildings.

[simplyWiri]

Consider the situation where we have a storage building which accepts:

Meat x53
Corn x33
Rice x75

With the previous system, if we went to haul some Meat - to this storage cell - we would get the maximum capacity for the cell, as (75-53) + (75-33) = 64, and we would look for ~64 meat to haul. This is incorrect behavour, as we can only haul 22 meat to this storage item.

This gets worse when you consider cases where we have, for example:

2/3 slots filled
Meat x1
Corn x75
[empty]

In this case, if we query for meat - we have a capacity of ~149 - if we only have 74 meat, - then consider hauling some apparel (or any other item which stacks to one) - we will then attempt to haul 75 items of apparel to a single cell.

• Fixes the bug described above
• Makes the debug logging a bit more consistent by adding pawn name as a common prefix