Calculated windows offsets are wrong when overloads are discontinuous

[asherkin]

Linux:

CForward::PushCell(int)
CForward::PushCellByRef(int *,int)
CForward::PushFloat(float)
CForward::PushFloatByRef(float *,int)
CForward::PushArray(int *,uint,int)
CForward::PushString(char const*)
CForward::PushStringEx(char *,uint,int,int)
CForward::Cancel(void)
CForward::~CForward()
CForward::~CForward()
CForward::GetForwardName(void)
CForward::GetFunctionCount(void)
CForward::GetExecType(void)
CForward::Execute(int *,SourceMod::IForwardFilter *)
CForward::RemoveFunction(SourcePawn::IPluginFunction *)
CForward::RemoveFunctionsOfPlugin(SourceMod::IPlugin *)
CForward::AddFunction(SourcePawn::IPluginFunction *)
CForward::AddFunction(SourcePawn::IPluginContext *,uint)
CForward::RemoveFunction(SourcePawn::IPluginContext *,uint)

Windows:

CForward::PushCell(int)
CForward::PushCellByRef(int *,int)
CForward::PushFloat(float)
CForward::PushFloatByRef(float *,int)
CForward::PushArray(int *,uint,int)
CForward::PushString(char const *)
CForward::PushStringEx(char *,uint,int,int)
CForward::Cancel(void)
CForward::`scalar deleting destructor'(uint)
CForward::GetForwardName(void)
CForward::GetFunctionCount(void)
CForward::GetExecType(void)
CForward::Execute(int *,SourceMod::IForwardFilter *)
CForward::RemoveFunction(SourcePawn::IPluginContext *,uint)
CForward::RemoveFunction(SourcePawn::IPluginFunction *)
CForward::RemoveFunctionsOfPlugin(SourceMod::IPlugin *)
CForward::AddFunction(SourcePawn::IPluginContext *,uint)
CForward::AddFunction(SourcePawn::IPluginFunction *)

The logic in formatVTable only looks at the previous function (in Linux order) when fixing up the overload order for Windows, but MSVC has moved the RemoveFunction overload from the end to be next to the other overload.

https://github.com/asherkin/vtable/blob/0455af6ac1b142aadcdb69e507b91729443b827d/index.html#L351

The solution is probably to pre-process the vtable to "move" the overloads together, as that looks like it would make the existing logic produce the correct result.