fix(port): make shock absorbers actually absorb shock damage

[LordZanos]

Add the SHOCK_ABSORBER flag to shock absorbers, and change vehicle::damage_all() so that parts on the same tile as a shock absorber take substantially less damage from transmitted shock damage in collisions.

Purpose of change

Ports CleverRaven/Cataclysm-DDA#43013

Vehicles generally take a lot of damage internally from collisions, this modifies the shock absorber part to provide a buffer on individual tiles.

Describe the solution

Port change.

Describe alternatives you've considered

Reducing collision damage across the board?

Testing

Spawned a solar car, welded a shock absorber onto one of the solar panel tiles, smashed the car into a radio tower repeatedly. Most of the panel in the back of the car were badly damaged or destroyed, the tile with the shock absorber was fine.

Additional context

This implementation is somewhat limited, only a tile with a shock absorber installed receives any protection.
It would probably also make sense to add shock absorbers to the default configurations of heavier vehicles in the game.

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