In VIPScanner_Command, move displaying of summary and errors to functions of their own
Display errors also when invoking VIP-scanner's CLI with the analyze-theme subcommand

Some errors don't need any check to be run, they are diagnosed by the scanner itself
(like an empty theme directory). As these errors can cause the analyze-theme subcommand
to fail, they should be displayed.
Fix i18nized plurals handling in VIPScanner_Command