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Read version number from file

Paul Gessinger-Befurtrequested to merge
version_number_from_file into master

This MR changes the cmake configuration to read the version number from a new file called version_number in the root directory. This is in anticipation of switching how (and where) we tag releases.

@rlangenb and my idea was the following:

  • We do development on master and feature branches (as before). The version number here is fixed to 9.9.9 and is not touched (file version_number never gets changes on master. 9.9.9 is a "valid" version number, and is always "newer" than any real version.
  • When we want to tag a release, we make an MR from master to a new branch release. This MR gets merged with a merge commit
  • On release we directly add a commit which only changes the version number in version_number.
  • This commit gets tagged

This does two things:

  • master always has a defined version, that is not an actual version, so there can be no confusion
  • We have all mainline tag commits on one single branch (and not scattered across release-* branches). For backports or bugfixes (which we don't really have at the moment) we can then still use dedicated branches.

Thoughts? (especially from @msmk)

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