Message subtype of Slack -- notes when coding #slackbackup.

subtypes.txt

bot_message: A message was posted by an integration
	bot_id
	username
	icons

me_message: A /me message was sent

message_changed: A message was changed
	(hidden)
	message

message_deleted: A message was deleted
	(hidden)
	deleted_ts

channel_join: A team member joined a channel
	inviter
	_template: {user} has joined the channel

channel_leave: A team member left a channel
	_template: {user} has left the channel

channel_topic: A channel topic was updated
	topic
	_template: {user} set the channel topic: {topic}

channel_purpose: A channel purpose was updated
	purpose
	_template: {user} set the channel purpose: {purpose}

channel_name: A channel was renamed
	old_name
	name
	_template: {user} has renamed the channel from "{old_name}" to "{name}"

channel_archive: A channel was archived
	members
	_template: {user} archived the channel

channel_unarchive: A channel was unarchived
	_template: {user} un-archived the channel

group_join: A team member joined a group
	inviter
	_template: {user} has joined the group
	
group_leave: A team member left a group

group_topic: A group topic was updated

group_purpose: A group purpose was updated

group_name: A group was renamed

group_archive: A group was archived

group_unarchive: A group was unarchived

file_share: A file was shared into a channel
	file
	upload
	_template: {user} (shared|uploaded) a file: {file}( and commented: ...)?

file_comment: A comment was added to a file
	file
	comment
	_template: {user} commented on {user}'s file {file}: ...

file_mention: A file was mentioned in a channel
	WTF

pinned_item: An item was pinned in a channel
	item
	item_type
	_template: <@U024BE7LH|cal> pinned their {_type} {file|message|...} to this channel.

unpinned_item: An item was unpinned from a channel

---

item type for pinned item:
+ * `C`: channel message
+ * `G`: private group message
+ * `F`: file
+ * `Fc`: file comments