the version numbering system
tl;dr: No, in this case, versions are simply a sequence of numbers and is definitely not a "progress bar".
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The original versioning system used here was traditional for software development and is referred to as semantic versioning (or SemVer). Long story short, "
v0.22.1" means:
0 - a major version;
22 - minor version, considerable but not colossal amount of changes;
1 - patch version, fix. A major version can indicate the readiness of a product:
0 - work in progress, beta, "early access";
1 - product is considered finished and complete, though it does not restrict from further improvements.
I believe, later Mirthal omitted the major version ("0") simply for convenience reasons, with the version becoming like v22.1.