Improve resolution of available support factories during ACU ehnancement to higher teches

[4z0t]

Description of the proposed changes

Reduces number of required selections down to 2 (was 7) that were resolving available support factories for construction during ACU enhancement to higher teches.

Testing done on the proposed changes

1. spawn all factions ACUs;
2. start upgrading them to t2 - no support factories are available;
3. spawn hqs for each factions of each type one by one checking that they appear in building list of ACUs;
4. repeat for t3 enhancement.

Additional context.

In perfect world we'd like to report from sim that we have hq of certain category and thus have available categories for support factories.

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.

[lL1l1]

Nothing is super broken but I caught an edge case and there's code at the end to clean up.

Spawn all ACUs command:

   CreateUnitAtMouse('ual0001', 0,   -2.00,    0.00, -0.00000)
   CreateUnitAtMouse('xsl0001', 0,    2.00,    0.00, -0.00000)
   CreateUnitAtMouse('url0001', 0,    7.00,    0.00, -0.00000)
   CreateUnitAtMouse('uel0001', 0,   -7.00,    0.00, -0.00000)

[4z0t]

These AI extensions sometime replace what I didn't want to replace 🤕

[lL1l1]

The function says it returns a modified list of buildables, not just the valid support factories. Idk why the UI works when you return only support factories.

Suggested change

	newBuildableCategories = newBuildableCategories * supportFactories
	newBuildableCategories = newBuildableCategories - categories.SUPPORTFACTORY + supportFactories

[4z0t]

Your suggestion is invalid because It makes all faction HQs to be buildable by any other