Fix some time-out / delay bugs in ACU agent

[mhasself]

Description

Key features:

• ACU: go_to_axes patiently waits for the warning horn to sound
• ACU: suppress Sun escape (and logging) if platform not moveable
• ACU: allow more time for _run_scan to enter ProgramTrack mode
• ACU: increase overall timeout

Motivation and Context

Addresses issues reported in #617, #619, #620. There are a few mysteries remaining but I think we should close these and get clean measurements of any new problems.

Resolves #617. Resolves #619. Resolves #620.

How Has This Been Tested?

Tested on SATP1. "Not moveable" suppression of Sun avoidance escapes was simulated with a time-based hack.

I am comfortable running this on any platform as is.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.

[mhasself]

I've just added two more fixes which should greatly improve quality of life.

I would like to get this deployed ASAP, as several of these bugs have been annoying SATP1 testing.