Add file logger and fix log level output (#9)

Improve logging output

Reviewed-on: #9

src/interface/IPrinterDriver.hpp

@@ -30,6 +30,7 @@ namespace ptprnt {
 
 class IPrinterDriver {
    public:
+    virtual ~IPrinterDriver()                                                     = default;
     virtual const std::string_view getDriverName()                                = 0;
     virtual const std::string_view getName()                                      = 0;
     virtual const std::string_view getVersion()                                   = 0;