[Cleanup] Add initiator/owner checks to various methods in questmgr.cpp

[Kinglykrab]

Notes

• Add initiator check to quest::permaclass().
• Add initiator check to quest::permarace().
• Add initiator check to quest::permagender().
• Add initiator check to quest::scribespells().
• Add initiator check to quest::traindiscs().
• Add initiator check to quest::unscribespells().
• Add initiator check to quest::untraindiscs().
• Cleanup initiator check in quest::pvp().
• Cleanup initiator check in quest::movepc().
• Cleanup initiator check in quest::gmmove().
• Cleanup initiator check in quest::movegrp().
• Add owner check to quest::doanim().
• Cleanup initiator check in quest::addskill().
• Cleanup initiator check in quest::setlanguage().
• Cleanup initiator check in quest::setskill().
• Cleanup initiator check in quest::has_zone_flag().
• Cleanup initiator check in quest::set_zone_flag().
• Cleanup initiator check in quest::clear_zone_flag().
• Add owner check to quest::sethp().
• Add owner check to quest::npcrace().
• Add owner check to quest::npcgender().
• Add owner check to quest::npcsize().
• Add owner check to quest::npctexture().
• Add initiator check to quest::playerrace().
• Add initiator check to quest::playergender().
• Add initiator check to quest::playersize().
• Add initiator check to quest::playertexture().
• Add initiator check to quest::playerfeature().
• Add owner check to quest::npcfeature().
• Cleanup initiator check in quest::popup().
• Add initiator check to quest::getlevel().
• Add initiator check to quest::collectitems_processSlot().
• Add initiator check to quest::countitem().
• Add initiator check to quest::removeitem().
• Add owner check to quest::FactionValue().
• Add initiator check to quest::enabletitle().
• Add initiator check to quest::checktitle().
• Add initiator check to quest::removetitle().
• Add owner check to quest::wearchange().
• Add owner check to quest::voicetell().
• Cleanup nullptr checks in quest::SendMail().