(svn r7759) -Merge: makefile rewrite. This merge features:

- A proper ./configure, so everything needs to be configured only once, not for every make.
 - Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
 - A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
 - Proper support for OSX universal binaries.
 - Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
 - Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.

src/currency.h

@@ -0,0 +1,45 @@
+/* $Id$ */
+
+#ifndef CURRENCY_H
+#define CURRENCY_H
+
+enum {
+	CF_NOEURO = 0,
+	CF_ISEURO = 1,
+	NUM_CURRENCY = 28,
+	CUSTOM_CURRENCY_ID = NUM_CURRENCY - 1
+};
+
+typedef struct {
+	uint16 rate;
+	char separator;
+	Year to_euro;
+	char prefix[16];
+	char suffix[16];
+	/**
+	 * The currency symbol is represented by two possible values, prefix and suffix
+	 * Usage of one or the other is determined by symbol_pos.
+	 * 0 = prefix
+	 * 1 = suffix
+	 * 2 = both : Special case only for custom currency.
+	 *            It is not a spec from Newgrf,
+	 *            rather a way to let users do what they want with custom curency
+	 */
+	byte symbol_pos;
+	StringID name;
+} CurrencySpec;
+
+
+extern CurrencySpec _currency_specs[NUM_CURRENCY];
+
+// XXX small hack, but makes the rest of the code a bit nicer to read
+#define _custom_currency (_currency_specs[CUSTOM_CURRENCY_ID])
+#define _currency ((const CurrencySpec*)&_currency_specs[_opt_ptr->currency])
+
+uint GetMaskOfAllowedCurrencies(void);
+void CheckSwitchToEuro(void);
+void ResetCurrencies(void);
+StringID* BuildCurrencyDropdown(void);
+byte GetNewgrfCurrencyIdConverted(byte grfcurr_id);
+
+#endif /* CURRENCY_H */