Rework the brain components

[Garanas]

The brain components are now in separate files. This allows you to hook the component before it is being applied to the standard brain class.

Testing done on the proposed changes

Start a scenario and observe that all the functionality (energy management, jammers, hqs, etc) are still functional.

Checklist

• Changes are documented in the changelog for the next game version

[Garanas]

The internal HQs field of the brain was not referenced by any of the existing mods and is therefore safe to rename.

[Garanas]

I won't touch the statistics module because of: #6129
And the same reasoning applies to the energy management module because of: #5822