[infrastructure] Update packages to use the follow-keyboard-version flag about keyboards HOT 4 CLOSED

@DavidLRowe and @LornaSIL can you clarify which keyboard packages in the repo should not get this flag?
<FollowKeyboardVersion/>

from keyboards.

from keyboards.

Most of the keyboards in the release folder are updated by PR #407 . See that PR for several odd cases.

from keyboards.

Still need to fix:

• gff_ethiopic_7 (should let @dyacob to fix)
  • gff_ethiopic_7/source/gff_ethiopic_7.kps has version "1.0" and no FKVflag, but gff_ethiopic_7/source/gff_ethiopic_7.kmn contains no &keyboardversion statement -- seems as though the .kmn needs to be updated to have a version number before the FKVflag can be set (or is the default version number 1.0?).
• sil_tchad (but Jeff H wants to update it, so should we wait?)
  • sil_tchad/source/sil_tchad.kps has version "3.3.1" and FKVflag set, but sil_tchad/source/sil_tchad.kmn has "store(&KEYBOARDVERSION) '3.3' " -- seems as though the version in the .kmn file needs updating.

The powerpacks will be deprecated so it's probably okay not to update them:

• release/packages/gff_amh_powerpack_7/source/gff_amh_powerpack_7.kps -- has multiple keyboards

from keyboards.