(svn r2815) Store the currency information in one central place instead of scattering it in several unrelated files

currency.h

@@ -0,0 +1,23 @@
+#ifndef CURRENCY_H
+#define CURRENCY_H
+
+enum {
+	CF_NOEURO = 0,
+	CF_ISEURO = 1,
+};
+
+typedef struct {
+	uint16 rate;
+	char separator;
+	uint16 to_euro;
+	char prefix[16];
+	char suffix[16];
+} CurrencySpec;
+
+extern CurrencySpec _currency_specs[];
+extern const StringID _currency_string_list[];
+
+uint GetMaskOfAllowedCurrencies(void);
+uint GetCurrentCurrencyRate(void);
+
+#endif