[NPCs] Allow NPCs to aim and attack properly when parented

[Blixibon]

Is your feature request related to a problem? Please describe.

When NPCs are parented to another object, they are unable to properly attack when the object's angles are not 0 0 0, presumably due to the usage of local origin/angles. This happens because NPCs were not designed to be parented, but allowing them to attack properly would make them much easier to use in more complex environments, such as being parented to helicopters or trains.

Describe the solution you'd like

Every instance of GetLocalAngles/Origin in the base NPC code could be replaced with the absolute counterparts.

Describe alternatives you've considered

Using logic_measure_movement instead, which may not always apply or function well.