(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/signs.h

@@ -0,0 +1,68 @@
+/* $Id$ */
+
+#ifndef SIGNS_H
+#define SIGNS_H
+
+#include "oldpool.h"
+
+typedef struct Sign {
+	StringID     str;
+	ViewportSign sign;
+	int32        x;
+	int32        y;
+	byte         z;
+	PlayerID     owner; // placed by this player. Anyone can delete them though. OWNER_NONE for gray signs from old games.
+
+	SignID       index;
+} Sign;
+
+DECLARE_OLD_POOL(Sign, Sign, 2, 16000)
+
+static inline SignID GetMaxSignIndex(void)
+{
+	/* TODO - This isn't the real content of the function, but
+	 *  with the new pool-system this will be replaced with one that
+	 *  _really_ returns the highest index. Now it just returns
+	 *  the next safe value we are sure about everything is below.
+	 */
+	return GetSignPoolSize() - 1;
+}
+
+static inline uint GetNumSigns(void)
+{
+	return GetSignPoolSize();
+}
+
+/**
+ * Check if a Sign really exists.
+ */
+static inline bool IsValidSign(const Sign *si)
+{
+	return si->str != STR_NULL;
+}
+
+static inline bool IsValidSignID(uint index)
+{
+	return index < GetSignPoolSize() && IsValidSign(GetSign(index));
+}
+
+void DestroySign(Sign *si);
+
+static inline void DeleteSign(Sign *si)
+{
+	DestroySign(si);
+	si->str = STR_NULL;
+}
+
+#define FOR_ALL_SIGNS_FROM(ss, start) for (ss = GetSign(start); ss != NULL; ss = (ss->index + 1U < GetSignPoolSize()) ? GetSign(ss->index + 1U) : NULL) if (IsValidSign(ss))
+#define FOR_ALL_SIGNS(ss) FOR_ALL_SIGNS_FROM(ss, 0)
+
+VARDEF bool _sign_sort_dirty;
+
+void UpdateAllSignVirtCoords(void);
+void PlaceProc_Sign(TileIndex tile);
+
+/* misc.c */
+void ShowRenameSignWindow(const Sign *si);
+
+#endif /* SIGNS_H */