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
#2640 fixed the FirstVoices OEM app from crashing on Android 5.0 devices.
This applies the same fix (updating to `androidx.appcompat:appcompat:1.2.0-alpha02`) for all the other Android apps.
* Also fix up history.md entries
