Burninate IDataPack (#864)

This doesn't break any extensions NOT using IDataPack, and we do not know of any that are.

* The extension storage utility of this interface has been broken for the last 9 months, with ISourceMod::CreateDataPack being disabled.
* The plugin interop utility of this interface (its stated purpose) has been broken for the last 11+ years, with ISourceMod::GetDataPackHandleType being disabled.

I imagine it only survived the first cleanup 11 years ago because CSS:DM was using it internally, which it has now been migrated away from.

Compiled all the included extensions without changes (API compat), and loaded extensions build pre-change without issue (ABI compat).

core/logic/common_logic.cpp

@@ -55,7 +55,6 @@
 #include "sprintf.h"
 #include "LibrarySys.h"
 #include "RootConsoleMenu.h"
-#include "CDataPack.h"
 #include "CellArray.h"
 #include <bridge/include/BridgeAPI.h>
 #include <bridge/include/IProviderCallbacks.h>
@@ -167,8 +166,6 @@ static sm_logic_t logic =
 	GenerateError,
 	AddNatives,
 	RegisterProfiler,
-	CDataPack::New,
-	CDataPack::Free,
 	CellArray::New,
 	CellArray::Free,
 	FromPseudoAddress,