fix(combat): prevent using combo skills until support is added

fix(data): correctly parse special cost

feat(game): add check for combo skill

feat(data): add skill cost, item vnum, dash, upgrade

feat(combat): add compound operation to simplify using skills

feat(combat): correctly handle dash range in simple attack technique

feat(combat): add method for removing current operation from combat state

chore(core): update version

fix(core): save CurrentState to avoid race condition

fix(combat): do not register contracts that failed to execute

feat(game): keep only skills of type Player in player's skills

feat(game): make sure skill cooldown reset is interpreted correctly when sent before "su"

feat(pathfinding): respond to su, tp, c_info packets to update position

feat(packets): make su packet position nullable

fix(game): do not update position from su packet if it is null

chore(game): update version

fix(game): update position of caster upon SuPacket

fix(core): do not update default state

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

fix(combat): use dash on character if needed