Added/changed:
- Added a dialog to choose a loan when the treasury is empty
[/*]
- Loans are now requiring a repayment on due date[/*]
- A list of active loans is now visible in treasury stats (Loan repayments row)
- Added a help page about loans[/*]
- Updated the help text for trading post[/*]
- Added a help page for oil workshop[/*]
- The game will now check if there are buildings left on the other side when demolishing a bridge[/*]
- Renamed construction office to construction shed (gonna need that name later)[/*]

Fixed:
- Map 3 had a few unremovable trees[/*]
- Some buildings were in a wrong menu category[/*]
- Could still build fully enclosed rowhouse yards in some cases leading to blocked entrances[/*]
- Potentially fixed a bug with disappearing top bar[/*]
- Building and then demolishing the only bridge led to other side becoming inaccessible forever[/*]