Version: build-in devel version comparisons

The heuristic used by the default version comparison is simple. A
version string is scanned for strings of digits, split into an array of
these strings, and then an element-wise comparison is done.

This fails when presented with something like

  Version.new("1.0.0beta7") <=> Version.new("1.0.0")

because the first three digits match, and the fourth digit of the
receiver (7) is greater than the assumed fourth digit of the parameter
(0).

Fix this by defining an element-wise comparator on a new VersionElement
class. This allows us to correctly compare "alpha", "beta", and "rc"
style version strings, and keeps the logic out of the main version
comparison.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

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