PCM: fix kicad version restriction logic

The json schema for packages implies that kicad min/max version
restriction takes major.minor.patch string but actual logic
only checks major and minor.

This fixes the logic to work with full major.minor.patch tuple.
Additionally the version max logic will substitute missing portions
with 999 for a reasonable default so that say 7.1 is still considered
as >= 7.1.5 when checking for max version.

Reported here
https://forum.kicad.info/t/updating-already-installed-plugins-using-content-manager/35532/5?u=qu1ck

(cherry picked from commit 06028d50)