D2605 identified some loot inconsistencies, but upon close inspection, it turns out there are many more, hence this, much larger, patch:
- Structure loot is standardized to 20% of cost.
- The only exception is the field, which cost wood, but grants food loot.
- <xp> is unchanged; could be done in a separate patch; applies to structures that shoot arrows.
- <Loot> nodes are moved to the same template files as where the <Cost> node is defined, to reduce potential confusion.
- Unnecessary <Cost> and <Loot> lines (e.g. <food>0</food>) are removed.
- <Cost> nodes are removed from templates if the majority of its children have different values.
- Inserted a <Cost> node in a few unbuildable structures (necessary for repairing them).