feat(sdbapi): patchgamestate checks, formatting

fix!(sdbapi): change JWT errors to the new spec

fix(sdbapi): apierror are now lowercase in json

feat(sdbapi): new error handling

feat(sdbapi): endpoint for joining games

feat(sdbapi): endpoint for getting own games

feat(sdbapi): endpoint for patching game state

feat(sdbapi): endpoint for all forming games

WIP(sdbapi): game creation API

feat!(sdbapi): change errors to apierror