Add speed and power cap upgrades to the Soul Engine

[ferriarnus]

Description

Makes it so the soul engine increases power gen and speed based on the used capacitor.

Closes #(issue)

Todo

• Things that are yet to be completed for this PR to no longer be a draft.

Checklist:

• My code follows the style guidelines of this project (.editorconfig, most IDEs will use this for you).
• I have performed a self-review of my own code.
• I have commented my code in areas it may be challenging to understand.
• I have made corresponding changes to the documentation.
• My changes are ready for review from a contributor.

[Rover656]

Looks sensible - this will come into play once we revisit the capacitor scaling balance :).
Thank you!