[Dhooks] Add the ability to work with the this parameter, which is an object

[A1mDev]

Sometimes we have to work with this parameter which is a class but dhooks doesn't have this feature, this PR solves this problem. This code has been tested on both post and pre hooks. Below is an example code for working with the new functionality.

/*class CBaseEntity : public IServerEntity
{
	...
protected:
	EHANDLE m_pParent;  // for movement hierarchy	
	...
};*/

MRESReturn Handler_CBaseEntity__OnTakeDamage(Address pThis, Handle hReturn, Handle hParams)
{
	// If EHANDLE type or entity returns entity index.
	// Index num 0, for working with this parameter

	int iParent = DHookGetParamObjectPtrVar(hParams, 0, 384, ObjectValueType_Ehandle);
	if (iParent < 1 || !IsValidEntity(iParent)) {
		return MRES_Ignored;
	}

	char sEntityName[64];
	GetEntityClassname(iParent, sEntityName, sizeof(sEntityName));
	
	PrintToChatAll("[Handler_CBaseEntity__OnTakeDamage] iParent: %s (%d)", sEntityName, iParent);
	
	return MRES_Ignored;
}

[Kenzzer]

Excellent work, especially given the situation that surround Address. The less we mess with memory directly in plugin, the better !
I just have a few request changes, but otherwise I think this is a good addition to dhooks.

[A1mDev]

I think I've finished this PR, I just need to check

[A1mDev]

I tested it with this type address, everything works fine!

[Kenzzer]

Thank you so much for seeing this through, it looks great! I'm going to let this sit a for little while longer, so others may review it as well. Otherwise I think this is ready to be taken in, thanks again!