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Remove Mechanical class in favour or using Siege and Ship.

Description

Remove Mechanical class in favour or using Siege and Ship.

Mechanical was a union of Siege and Ship and not very used.
The '_mechanical' part of template names was removed in rP22204.

Replace its usage with Ship and/or Siege where relevant.

Reviewed By: wraitii

Patch By: Nescio

Differential Revision: https://code.wildfiregames.com/D2201