Add: [GS] Allow to set max loan for each company separately (#11224)

src/company_cmd.cpp

@@ -95,6 +95,16 @@ void Company::PostDestructor(size_t index)
 	InvalidateWindowData(WC_ERRMSG, 0);
 }
 
+/**
+ * Calculate the max allowed loan for this company.
+ * @return the max loan amount.
+ */
+Money Company::GetMaxLoan() const
+{
+	if (this->max_loan == COMPANY_MAX_LOAN_DEFAULT) return _economy.max_loan;
+	return this->max_loan;
+}
+
 /**
  * Sets the local company and updates the settings that are set on a
  * per-company basis to reflect the core's state in the GUI.