New Feature: Added up to 15 game difficulty settings (by Jazz)

- Externalized the difficulty setings to "TableData\DifficultySettings.xml" file
- Some INI Settings (ja2_options.ini, CTHConstants.ini and Creature_Settings.ini) moved from INI file to this xml file
- see #define DIFFICULTY_SETTING

git-svn-id: https://ja2svn.mooo.com/source/ja2/trunk/GameSource/ja2_v1.13/Build@7447 3b4a5df2-a311-0410-b5c6-a8a6f20db521

Strategic/Strategic Mines.cpp

@@ -24,6 +24,10 @@
 	#include "Facilities.h"
 #endif
 
+#ifdef DIFFICULTY_SETTING
+#include "GameInitOptionsScreen.h"
+#endif
+
 #include "Strategic Mines LUA.h"
 #include <vector>
 
@@ -194,7 +198,11 @@ void InitializeMines( void )
 			ubMineProductionIncreases = 15;
 			break;
 		default:
+			#ifdef DIFFICULTY_SETTING
+			ubMineProductionIncreases = 25;
+			#else
 			Assert( 0 );
+			#endif
 			return;
 	}