support broadcast voice memos (?)
context
- unlike attachments, voice memos cannot be sent with captions
- that means admins cannot prefix voice memos with a
!
- that means admins cannot send voice memos as broadcast messages (subscribers can send incoming voice memos as hotline messages, since these require no text)
- with some work, we could parse incoming messages that throw
NO_COMMAND
parse errors to see if they are voice memos, and -- if so -- treat them like broadcasts... - should we?
behavior
todo...