Introducing drafts
Removed caching of draft
Fixed replaceInsertTags being called statically
Changed order of methods so they match previous version (easier to diff)
Do not make deprecated method public static if they have been protected previously
CS
Removed useless EmailDraftInterface
Removed language cache
CS
Renamed the interface
Renamed "Draft" to "MessageDraft"
Merge branch 'develop' into feature/postmark-gateway
Postmark gateway now also implements drafts