Handle multiple VM name arguments

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Add support for multiple VM arguments.

Commands

• delete
• edit (passes each as an argument to $EDITOR -- vim handles this nicely using buffers)
• publish
• start
• stop

Notes

• Added a CmdResult type to utils/utils.go in order to aggregate errors as we iterate through VMs. This way, one failed iteration won't cancel the remainder.
• Added a check to skip duplicate names (e.g. alpine publish foo foo will only publish once).
• Removed VM already stopped error from qemu/ops.go:Stop() to avoid weirdness. This now just fails silently/is idempotent.
• AutoCompleteVMNames() is already ready for multiple VMs, works as intended.

Additional note

During testing, I ran launch many times. One time, I got a really unfortunate VM name from the randomizer. So, I went through the dictionaries (adjectives.txt and nouns.txt) and manually cleaned them up. No guarantee that I did a perfect job, but it should help mitigate issues in the future. In summary:

• Removed explicit or explicit-adjacent words
• Removed words that are very negatively constructed and may cause confusion/concern
• Removed words that specify individual people (person, girl, boyfriend, etc)
• Removed words with various systems meanings to avoid confusion (error, data, etc)

Closes #87 Closes #88 Closes #89 Closes #91

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@idroz :)

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I didn't add a ParseVMNames helper function because Tags are still WIP. I'll roll up this functionality and de-duplicate it across the commands, and add tag support, all in the next/final Tags PR.