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);
 };

osx/classes/scenario.h

@@ -100,7 +100,7 @@ public:
 	cOutdoors* outdoors;
 	cTown* towns;
 	
-	char(& scen_strs(short i))[256] __attribute__((deprecated));
+	__declspec(deprecated) char(& scen_strs(short i))[256];
 	cScenario& operator = (legacy::scenario_data_type& old);
 	void append(legacy::scen_item_data_type& old);
 	void writeTo(std::ostream& file);

osx/classes/town.h

@@ -99,7 +99,7 @@ public:
 	char comment[3][256];
 	char spec_strs[100][256];
 	char sign_strs[20][256];
-	char(& town_strs(short i))[256] __attribute__((deprecated));
+	__declspec(deprecated) char(& town_strs(short i))[256];
 	cSpeech talking;
 	
 	virtual ~cTown(){}

osx/classes/universe.h

@@ -56,9 +56,9 @@ public:
 	void append(unsigned char(& old_sfx)[64][64], unsigned char(& old_misc_i)[64][64]);
 	void append(legacy::big_tr_type& old);
 	
-	unsigned char explored(char x,char y) const __attribute__((deprecated));
-	unsigned char misc_i(char x, char y) const __attribute__((deprecated));
-	unsigned char sfx(char x, char y) const __attribute__((deprecated));
+	__declspec(deprecated) unsigned char explored(char x,char y) const;
+	__declspec(deprecated) unsigned char misc_i(char x, char y) const;
+	__declspec(deprecated) unsigned char sfx(char x, char y) const;
 	
 	cTown* operator -> ();
 	cCurTown();