Update 1.53c: More Bug Fixes

Hey Everyone,

This is a pretty small patch, but if fixes some issues that were causing some trouble...

Patch Notes:

- Trade expenses are now properly in their own field, rather than rolled into the trade income field.
- The defunked "Maintenance" field has now been removed from the stats area (this no longer did anything).
- Fixed a bug having to do with trading posts not buying trade goods under rare circumstances...
- Lumberjacks chop wood a bit faster.
- Fixed a bug that could cause imperial request timers to not count down properly.
- Level 10 has had its trade quantities slightly increased.