Apart from QtUI bits, this addresses use of uncaught numeric cast exceptions in message count handling, the spell parser and the MacOS idle querier. The WindowsServicePrincipalName logic previously had an issue where using ports from 32768 onwards would result in a bad_numeric_cast exception to be thrown. This has been addressed at the same time as the uncaught exceptions, and all ports should work now. The tags file has been extended to ignore more files. Change-Id: I73ced35f06517bee5c58f990d20fa437b40ac84e