Currently, automatic Keyman minimum version determination works for all
features in Keyman keyboards _except_ `U_xxxx_yyyy` touch key
identifiers.
This change adds the automatic keyboard versioning functionality to the
keymanweb compiler as well, following the pattern that's in kmcmplib.
This makes the `store(&version)` line completely optional, and it may
be possible to deprecate it in future versions of Keyman Developer.
3497e97b00