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).

bridge/include/BridgeAPI.h

@@ -35,7 +35,7 @@ namespace SourceMod {
 
 // Add 1 to the RHS of this expression to bump the intercom file
 // This is to prevent mismatching core/logic binaries
-static const uint32_t SM_LOGIC_MAGIC = 0x0F47C0DE - 56;
+static const uint32_t SM_LOGIC_MAGIC = 0x0F47C0DE - 57;
 
 } // namespace SourceMod
 

bridge/include/LogicProvider.h

@@ -50,7 +50,6 @@ class IProviderCallbacks;
 class IExtensionSys;
 class ITextParsers;
 class ILogger;
-class IDataPack;
 class ICellArray;
 
 struct sm_logic_t
@@ -70,8 +69,6 @@ struct sm_logic_t
 	void			(*GenerateError)(IPluginContext *, cell_t, int, const char *, ...);
 	void			(*AddNatives)(sp_nativeinfo_t *natives);
 	void            (*RegisterProfiler)(IProfilingTool *tool);
-	IDataPack *     (*CreateDataPack)();
-	void            (*FreeDataPack)(IDataPack *pack);
 	ICellArray *    (*CreateCellArray)(size_t blocksize);
 	void            (*FreeCellArray)(ICellArray *arr);
 	void *			(*FromPseudoAddress)(uint32_t pseudoAddr);