Object respawn functions

[FileEX]

Added respawnObject and toggleObjectRespawn to the server-side.
Added new function isObjectRespawnable as shared function.

This PR is part of #3405

[TracerDS]

Would toggleObjectRespawn work only if the object broke?

[FileEX]

Yes - I don't think it matters when it comes to returning false for toggleObjectRespawn, because the object respawn logic checks if the object has 0 hp anyway, so returning false for unbreakable objects won't change much here

mtasa-blue/Client/mods/deathmatch/logic/CClientObject.cpp

Lines 432 to 434 in d93287d

	// Don't stream the object in, if respawn is disabled and the object is broken
	if (!m_bRespawnEnabled && m_fHealth == 0.0f)
	return;

mtasa-blue/Client/mods/deathmatch/logic/CClientObject.cpp

Lines 463 to 471 in d93287d

	// Save the health
	if (m_pObject)
	{
	// If respawn is enabled, reset the health
	if (m_bRespawnEnabled && m_fHealth == 0.0f)
	m_fHealth = 1000.0f;
	else
	m_fHealth = m_pObject->GetHealth();
	}

[TracerDS]

Good job!