Change snap name separator character
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Issue body
### What needs to get done
For entries in both `build-snaps` and `stage-snaps`, consider using a non-slash character that is both YAML- and command-line-friendly and unambiguously delineates name versus channel, e.g. `curl==latest/stable`.
This should be propagated to other fields that identify snaps, such as in Imagecraft's `snap-preseed` and `uc-prepare` plugins.
### Why it needs to get done
The current syntax is `name/channel`. This is awkward because `channel` is itself `track/risk`, resulting in strings like `curl/latest/stable`. Though technically unambiguous to parse, it is inelegant and doesn't match other tools.
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