* Query instance for toot character limit
Fixes#393
* Move maximumTootCharacters to instance field
* Add caching for maximum toot characters, expanding on the emoji list storage
* Update formatting per review feedback
* Fix compose activity tests
* Rename mastodon api point for nicer interaction with kotlin
* Default emoji list to empty list instead of null, to appease json converters in failure cases
* Use empty list helper
* Fix database migration