Runtime: Make use of std::make_unique where applicable

Makes use of the C++14 make_unique allocation function to allocate class
instances where applicable instead of a reset with a new operator within
it.

This doesn't touch cases where buffers are allocated, given make_unique
would zero-initialize them.

Runtime/World/CFire.cpp

@@ -14,7 +14,7 @@ CFire::CFire(TToken<CGenDescription> effect, TUniqueId uid, TAreaId aId, bool ac
              float f3, float f4)
 : CActor(uid, active, "Fire"sv, CEntityInfo(aId, NullConnectionList), xf, CModelData::CModelDataNull(),
          CMaterialList(EMaterialTypes::Projectile), CActorParameters::None(), owner)
-, xe8_(new CElementGen(effect))
+, xe8_(std::make_unique<CElementGen>(effect))
 , xec_ownerId(owner)
 , xf0_damageInfo(dInfo)
 , x10c_damageInfo(dInfo)