Orders two dotted-number versions.
One version.
The other.
Negative when a is older, positive when newer, zero when equal.
a
['1.10.0', '1.2.0'].sort(version_compare); // ['1.2.0', '1.10.0'] Copy
['1.10.0', '1.2.0'].sort(version_compare); // ['1.2.0', '1.10.0']
Orders two dotted-number versions.