Add support for creating and receiving interactions
This commit does **not** add support for responding to interactions. It
sticks very closely to the official Discord api and provides hardly any
convenience methods. These can be added in upcoming commits.
|Status:||all builds with this change have finished|
|Revision:||ccc7b6b33296e907dbea66fb5ea5d7b6141e202b||VCS Root:||Javacord on GitHub (Git)|
|TeamCity user:||Unknown (none of TeamCity users defined [email protected] username in their VCS username settings)|
No failed tests