tests(core): add tests for contracts

feat(combat): update operations to be non-blocking, add support for handling waiting

chore(game): update version

fix(game): make skills api safer by treating dash correctly and allowing only player skills

feat(data): add attack type and element types

feat(data): add skill attack type, uses secondary weapon and element

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

feat(core): avoid deadlock in contractor

chore: update versions

chore: update version

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

chore: update versions

fix(core): do not throw an exception when adding IEveryPacketResponders

fix(packets): make mltobj packet list a list index

fix(packets): add packet header for sayi2 packet

fix(game): do not add game responder multiple times

fix(game): add skills api to the service provider

fix(game): make aggregate error only for errors, not successful results in event dispatcher

fix(core): do not add packet responder multiple times

chore: update versions