Remove several unused fields from various blueprints

[Basilisk3]

Description of the proposed changes

This PR removes the following fields from various blueprints:
bp.General.TechLevel
bp.General.Classification
bp.General.Category
bp.General.UnitWeight

Testing done on the proposed changes

All units I tested still functioned normally.

Additional context

According to an older Discord post by @The-Balthazar, these fields can be removed safely.

Checklist

• Changes are documented in the changelog for the next game version (in Remove the 'BuildOnLayerCaps' field from the blueprints of all mobile units #6149).

[Garanas]

To solidify #6171 (review), the field Classification is used by the Spooky unit viewer. I then had to fix that by 'guessing' the classification and it's not entirely correct yet:

• Try to re-compute the classification spooky-db#115

We already did a 'whoopsie' in #5169 , but point is that even though these values may not be used by the game they can still be read somewhere as they existed for eternity. Please verify if the unit viewers will be fine.

[The-Balthazar]

I have always said that things relying on those fields are prone to the data being wrong because it's not actually used, and I think the fact that Spooky used to have to redefine the values of the Kennels is a prime example of that. But it's still important to make sure things aren't breaking.