Small VRX 2023 changes

[cbrxyz]

Description

Changes:

• Heisenbug in mission runner: Mission tasks were not being tracked in a data structure, leaving them prone to deletion. Tasks are now added to a set. More info about this here: https://textual.textualize.io/blog/2023/02/11/the-heisenbug-lurking-in-your-async-code/
• VRX classifier dying: Fixed the VRX classifier causing the mission to fail to spin up by moving it earlier in the file.
• Ensuring VRX mission works with new axros: Last VRX changes were before the new version of txros, axros. The mission now works with this library.

[kawaiiPlat]

does what it says on the tin

[andrew-aj]

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