Changed logic of work with market data.
User have to cancel on it's own streaming market data request (snapshot=false), but can receive market ticks
as much time as he/she needs.
User may cancel snapshot market data request (snapshot=true), or wait 11 seconds while snapshot request automatically close in TWS API.
Changed logic of work with market data. User have to cancel on it's own streaming market data request (snapshot=false), but can receive market ticks as much time as he/she needs. User may cancel snapshot market data request (snapshot=true), or wait 11 seconds while snapshot request automatically close in TWS API.