Allow NPCs to face targets while parented

[Blixibon]

This pull request replaces the "local" origin/angle calls used for NPC facing and aiming with "absolute" origin/angle calls. This fixes issues with NPCs not being able to aim at or face targets while parented to an entity.

Normally, the "local" and "absolute" origin/angles of an entity are identical. They are only different when the entity is parented to another entity. When parented, the "local" origin/angles is relative to the parent, while the "absolute" origin is relative to the world as before. Most NPC calculations use the local origin and angles, presumably because local vectors are cheaper to calculate and NPCs are not normally parented. This causes issues in their navigation and facing code when a NPC is parented, but this PR will fix the latter.

Since the local and absolute origin/angles are identical when an entity is not parented, this also means these changes do not have any effect on NPCs which are not parented.

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Does this PR close any issues?

• [NPCs] Allow NPCs to aim and attack properly when parented #254
  • (Note that the issue suggests replacing all instances of local origin/angles in NPC code. This PR only replaces instances that are used for facing/aiming code.)

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