- example of usage ReaderStillConnectedM() lib function in timerPoll_Tick event handler.
- timerPoll is enabled now from start of the application (Enabled Polling Readers).
- removed usage of deprecated ReaderList_GetSerialByIndex(). Using ReaderList_GetSerialDescriptionByIndex() instead.

No commit message

- dll for uFCoder v3.4.1 contains functions for single and multi uFR,and they have handle,and postfix M in name