New feature: mines require workers for maximum income, these can be trained like militia.

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@8267 3b4a5df2-a311-0410-b5c6-a8a6f20db521

GameSettings.h

@@ -1296,6 +1296,12 @@ typedef struct
 
 	FLOAT gMercLevelUpSalaryIncreasePercentage;
 
+	// Flugente: mine income can depend on the number or workers we have
+	BOOLEAN fMineRequiresWorkers;
+	FLOAT dInitialWorkerRate;
+	UINT32 usWorkerTrainingCost;
+	UINT8 usWorkerTrainingPoints;
+
 	UINT8 ubChanceTonyAvailable; // silversurfer/SANDRO
 
 	BOOLEAN fShowSkillsInHirePage;