Tentative merge of ben-mac-port (only dead for three years!) into the trunk.

This doesn't include any mkfiles.pl glue, and is missing one or two other
fixes.  The terminal emulator is kind of working, though, as, I believe, is
the store module.  Everything else is yet to be done.

[originally from svn r2226]

mac/macstuff.h

@@ -0,0 +1,29 @@
+/*
+ * macstuff.h -- Mac-specific definitions visible to the rest of PuTTY.
+ */
+
+typedef void *Context; /* FIXME */
+
+/*
+ * On the Mac, Unicode text copied to the clipboard has U+2028 line separators.
+ * Non-Unicode text will have these converted to CR along with the rest of the
+ * content.
+ */
+#define SEL_NL { 0x2028 }
+
+
+#include <Events.h> /* Timing related goo */
+
+#define GETTICKCOUNT TickCount
+#define CURSORBLINK GetCaretTime()
+#define TICKSPERSEC 60
+
+#define DEFAULT_CODEPAGE 0	       /* FIXME: no idea how to do this */
+
+#define WCHAR wchar_t
+#define BYTE unsigned char
+
+/* To make it compile */
+
+#include <stdarg.h>
+extern int vsnprintf(char *, size_t, char const *, va_list);