+ GetDllVersionStr() new DLL import function for getting version of the library

+ Display DLL version at the application start

* The button "Open All Readers" is always active and now may press more times

* Application measure execution time of the ReaderList_UpdateAndGetCount() function and display the time in Debug field.

- Closing all opened readers before call "Open All Readers" is removed

* DLLs updated to version 3.9.1

-Removed deprecated function from library {DL_API UFR_STATUS EnableXRC(int on)}

-Implemented new function from library DL_API UFR_STATUS EnableXRC(int on);

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- 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.

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