uFCoder multi-readers tester version 2.3

+ 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