pad_major will keep the string as it is.
If the minor and/or patch versions are present, then they are left intact.
112.1.3 –> 112.1.3
112.1 –> 112.1
112 –> 112
pad_major_minor will zero pad the minor version if it is not present.
If the patch version is present, then it is left intact.
112.1.3 –> 112.1.3
112.1 –> 112.1
112 –> 112.0
The following are dumb string manipulations to pad out a version number.
We might use a version library if we need much more functionality, but right now
it’s isolated in a single file where it can be replaced as/when necessary.