Exchange 2013 SP1 CU9 & 2016 Preview

New: Support for Exchange 2016 Preview
New: Support for Exchange 2013 SP1 CU9
New: --debug command line parameter for debug tab
Fix: Check DNS TXT record (support multiline)
Fix: Better GUI multithreading
Fix: Improved install process
Fix: Improved domain lookup in DKIM Signer