* Consistent license message for all the go files
* Fixing the last set of unconsistencies with the license headers
* Addressing PR review comments
* Fixing busy.go and busy_test.go license header
* Set EditAt for FileIds and Attachments; Disallow update/patch of FileIds in API Handler
* Add custom comparison methods for StringArray and Post Attachments
* gofmt
* Split up comparison function to child structs
* Naming consistency
* gofmt
* Webhooks: Allow "true"/"false" for bool values in payload body
Some slack integrations encode bool fields as "true"/"false", which
was previously unsupported in mattermost due to how encoding/json works.
This commit adds an aliased type for bool that implements json.Unmarshaler
to maintain compatibility with Slack.
* Add missing copyright header to added files
* ignore null array items in incoming webhooks / command responses
* consolidate code, process announcements in command response as well
* make a bit more idiomatic, add tests
* add missing file
