try to group travis jobs more logically

[dhalbert]

First try: group by category. Ten jobs, which seems like too many, but let's see how long each one takes to run.

[dhalbert]

I think I'd like to remove trinket_m0_haxpress, feather_m0_supersized, and feather_radiofruit_zigbee from regular builds. @dastels, comments on the first two? @ladyada zigbee board is not a product?

[jerryneedell]

@dhalbert will they still be available for manual build. That is, will the board definitions remain in the repo?

[dhalbert]

@jerryneedell Yes, I just am not sure there are many physical instances of these in the real world. Do you have some?

It's just an idea.

[jerryneedell]

I have a feather_m0_supersized, but I'm fine with it not be part of the build process. As long as I can build it myself.

[jerryneedell]

Also, if you want to stop maintaining it completely, that is OK with me - Jus t so I know to keep what I need to build it locally in the future.

[dhalbert]

@tannewt the build time for the first subjob went to 1.5 hours after I accepted the -flto merge for nRF52. I rearranged things to this. Would you be willing to accept this for now to get the jobs more balanced again (and shorter) for now until GitHub actions is working? Here's the latest build: https://travis-ci.com/adafruit/circuitpython/builds/123654081. There's a short test-only job, a shorter nRF job, and the 5 others are similar to before. So not just 5 like before, but still some empty slots for other stuff to get a chance to run.

[dhalbert]

@jepler if you are willing to review this now we can speed up the builds before @tannewt wakes up :)

[jepler]

I semi-manually checked that the list of boards is the same "before" and "after", and didn't spot any differences.