Eliminate use of __attribute__

Ideally this would be standard C++, but here I've settled for things that should be supported by both clang and VS/cl.exe:
- Deprecated attribute retained, but now uses __declspec syntax
- Packed attribute replaced with pragma pack, except one instance where it unnecessary
- Aligned attribute replaced with explicit padding bytes inserted in the structs where needed
- Unused attribute simply removed (though where possible, the unused entities were also removed)

osx/classes/outdoors.h

@@ -66,7 +66,7 @@ public:
 	char sign_strs[8][256];
 	bool special_spot[48][48];
 	
-	char(& out_strs(short i))[256] __attribute__((deprecated));
+	__declspec(deprecated) char(& out_strs(short i))[256];
 	cOutdoors();
 	cOutdoors& operator = (legacy::outdoor_record_type& old);
 };