Add ability to smash vehicle parts on removal

[anothersimulacrum]

Summary

SUMMARY: Infrastructure "Add the ability to smash vehicle parts on removal"

Purpose of change

The inability to remove helicopter parts right now means you can get a little stuck because you can't disable a helicopters rotors to enable you to remove parts.

To fix this, add the ability to smash parts on removal, and makes this occur for rotors. As such, you can smash apart rotors and no longer need to worry about being unable to remove parts because there is rotor.

Describe the solution

in veh_interact::can_remove_part(), exclude parts with the SMASH_REMOVE flag from the NO_MODIFY_VEHICLE restriction. Also add special info for this part.

In veh_interact::complete_vehicle(), use the same logic as removing a broken part for populating the items given on removing the vehicle part. Also train skills when smashing these parts, as when removing non-broken parts.

Testing

Spawn in a helicopter. Remove the rotors. Receive scrap metal.

Additional context

This will likely also be useful for further adjustments to vehicles in the future.

[Night-Pryanik]

Honestly I don't understand why one can't carefully dismantle rotors from a helicopter and get them in good shape and not in a form of scrap metal.