fix(core): do not try to create stateful instance in case the entity is already present

fix(core): make stateful repository return the correct type

feat(core): add possibility to add items to stateful repository manually

chore: move repository url and license to Directory.Build.props

docs: add missing documentation

chore(core): update version

fix(core): save CurrentState to avoid race condition

fix(core): do not update default state

fix(core): do not react to contracts that errored

chore: update versions

Merge pull request #60 from Rutherther/feat/combat-v1

Make combat nonblocking, make multiple queues for distinct operations

chore: use version prefix to allow for setting a version suffix

chore(core): update version

fix(core): remove a contract after timeout

feat(core): add support for timeout moving to errors

fix(core): do not wait in case state was already reached

feat(core): avoid deadlock in contractor

chore: update versions

fix(core): register contract after first state was executed

chore: update versions