feat: advanced semver "less than (and equal to)" support (#1435)

Adds support for "less than" semver, and for complex semver values that end in "less than" e.g. ">= 1.0.0 < 2.0.0". Also supports complex semver values that end in "less than or equal to", although they make a lot less sense, e.g. ">= 1.0.0 <= 2.0.0".

Closes #1433