Previously the builder scripts defined a readonly `VERSION` environment
variable for the Keyman version. That caused problems when another
(external) script tried to define a `VERSION` variable. We encountered
this problem when trying to move the TC build steps of a configuration
into a single script (#13399) when we tried to source `~/.nvm/nvm.sh`.
This change uses a Keyman specific prefix for the version variables and
renames `VERSION` → `KEYMAN_VERSION` etc. Unfortunately these variables
are used in a lot of places, so this turned out to be a bit of a yak
shave.
Test-bot: skip
This change fixes a problem if both `master` and a branch added the same
symbol with different version numbers. This causes a merge conflict which
previously caused the API checks to output an error. However, if the
version number in the .symbols file got updated since the base then
it's no error which this change implements.
Due to Debian policy the libkeymancore package will now include
the SONAME (API version number) in the package name (PR #10800). This
change adjusts the API verification checks to be able to cope with
the modified .symbols file.
If lines got removed in the .symbols file we won't find the current
version number in the .symbols file. This change fixes the expectations.
Also, if a major API change happens during the Alpha cycle we don't expect
another API version increment if one already happened since we released
the stable version.
This change also adds some unit tests for the new functionality. These
can be run manually and won't run during CI builds.
Fixes#10453.
