refactor sq api init

[uniboi]

Makes initializing the SquirrelManagers more readable by having definitions for CLIENT, UI & SERVER vm in one place. Currently it looks like this

ON_DLL_LOAD_RELIESON("client.dll", ClientSquirrel, ConCommand, (CModule module))
{
	// ...

	g_pSquirrel<ScriptContext::CLIENT>->__sq_defconst = module.Offset(0x12120).As<sq_defconstType>();
	g_pSquirrel<ScriptContext::UI>->__sq_defconst = g_pSquirrel<ScriptContext::CLIENT>->__sq_defconst;

	// repeat for every function ...
}

ON_DLL_LOAD_RELIESON("server.dll", ClientSquirrel, ConCommand, (CModule module))
{
	g_pSquirrel<ScriptContext::SERVER>->__sq_defconst = module.Offset(0x12120).As<sq_defconstType>();

	// repeat for every function ...
}

The redundancy is annoying and makes it hard to see at a glance what the offsets for the functions are.

This PR implements this function that initializes the functions either on the CLIENT & UI or on the SERVER dynamically:

// Initialize a function on the CLIENT and UI or SERVER, depending on context
template <ScriptContext context, typename T>
void SetSharedMember(SquirrelManager<context>* manager, T* member, const CModule module, const int clOffset, const int svOffset)
{
	switch (context)
	{
	case ScriptContext::CLIENT:
	{
		*member = module.Offset(clOffset).As<T>(); // Set the member for the CLIENT vm
		*(T*)((char*)g_pSquirrel<ScriptContext::UI> + (int64_t)member - (int64_t)manager) = *member; // Set the member for the UI vm
		break;
	}
	case ScriptContext::SERVER:
		*member = module.Offset(svOffset).As<T>();
	}
}

Initializing a function for all vms now looks like this:

template <ScriptContext context> void InitSharedSquirrelFunctions(SquirrelManager<context>* manager, CModule module)
{
	SetSharedMember<context, sq_defconstType>(manager, &manager->__sq_defconst, module, 0x12120, 0x1F550);
}

The issue with this is that the memory layout of classes is ub afaik

[GeckoEidechse]

*bump*

[GeckoEidechse]

@uniboi just a heads-up that this PR has some merge conflicts atm

[GeckoEidechse]

merge conflicts still

[GeckoEidechse]

Converting to draft until merge conflicts are addressed. cc @uniboi