* On windows, the change in a global GIT_COMMIT_HASH define in each
project needing it meant a full rebuild every time the commit changed.
* Ideally we'd set the define only on one file in each project, but
MSBuild doesn't seem to support that. Instead we make a new tiny
project that compiles a single cpp exporting a global var, and
reference that global var in each other project.
* Added a couple of utility macros to help with the conversion. lit() is
paired with tr() for untranslated text.
* QFormatStr is more explicitly for non-textual formatting strings.
* Both are just #define'd to QStringLiteral()
* Tacking -official onto the git hash was a hack only needed on windows,
and since we want more information it doesn't scale.
* Instead we track anything we need to know about the version in
separate variables, like whether it's a stable build or a nightly/
local build. Or if it's built by a downstream distribution then the
version number for the downstream build.
baldurk