Use seated pos when checking entity distance

[Endalion]

CHANGE, REASON

• Use the seat position where valid in entity distance checks
  • Utilise the seat position in ship for distance checks which is guaranteed to be accurate for checks on the same ship
• Entity::getEyePosition without partial tick uses VS2 modification as well
  • pick does not use entity distance checks instead it uses IForgePlayer::canReach, which uses Entity::getEyePosition(), which is not mixin'ed by VS2 (only Entity::getEyePosition(F) is)

KNOWN EFFECTS

• Interacting with a moving ship while seated on it is significantly more reliable, up to 1km/s (tested)

CAVEATS

NOT TESTED ON FABRIC

• no guarantees when player is not seated See: Improved Dragging & Entity Interactions on Ships [Pathfinding, POIs, Raids, etc.] #1027
• not tested to work between ships, I have no clue when that'd ever apply in normal gameplay

[ThePlasticPotato]

Merged into #1027 as of commit b84d58a.