Implemented automatic upgrade
Fixed bug with micronuke cannon

Had wrong damage value.
Added error for objSetItemData and others

When trying to set item properties on an object, if the item is not
found, we return an error. Used to return Nil.
Fixed bug in which maxHPBonus didn't always work

Didn't work if setting to a value above max. Also didn't work if
increasing beyond max.
loadOnUse for images now defaults to TRUE
TransData: Fixed bugs in decompiling TDBs