Improve beam weapon economy drain

[lL1l1]

Description of the proposed changes

Allows high cost + high drain beams to be powered off of stored energy. Also prevents energy stalls from a beam firing when you have high income but low energy trend.

Testing done on the proposed changes

Novax satellite with 72k energy requirement and 5000 energy drain can fire off of 4 storages (40k e) + adjacent t3 pgen (3125 e/s).
I went through usages of the function and didn't see any functional part that would cause the beam to stop mid-way through the firing stage.

There is a bug where waiting for drain cancels a firing tick because default fire ready state has no transition to fire state after waiting for econ drain.

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in a changelog snippet according to the guidelines.
• Request 2-3 reviewers from the list of reviewers and their areas of knowledge.

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