[wix-users] Allow version string of 4 digits

[Sverre Moe]

Running WiX to produce an MSI/EXE fails, because we are using a version
with 4 digits.

Version string may have up to 3 components - major.minor.build .
Version string is not compatible with MSI rules [1.10.0.1]

We need to support using 4 digits in our version.
major.minor.bugfix.patchfix

Is there any way this can be done with WiX Toolset when producing an
MSI/EXE?