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
Use a shared function standard_meson_build to prep the
resources/meson.build folder for consistency. A future cleanup would be
to use meson-utils.inc.sh for all meson build scripts.
* Adds `VERSION_WITH_TAG` variable to standard.meson.build
* Consistently uses `file('VERSION.md')` to retrieve version number
Note that VERSION_WITH_TAG is not yet used but should be used for
version tagged files later.
