[libcalamares] Add convenience for QDebug.noquote()

- Use << Logger::NoQuote{} to turn off quoting **and** the space
- In practice, in Calamares we use this only around other processes'
  output, where we want neither quotes nor spaces.

src/libcalamares/utils/Logger.h

@@ -33,6 +33,9 @@ struct FuncSuppressor
     const char* m_s;
 };
 
+struct NoQuote {};
+struct Quote {};
+
 DLLEXPORT extern const FuncSuppressor Continuation;
 DLLEXPORT extern const FuncSuppressor SubEntry;
 
@@ -74,6 +77,18 @@ operator<<( QDebug& s, const FuncSuppressor& f )
     return s << f.m_s;
 }
 
+inline QDebug&
+operator<<( QDebug& s, const NoQuote& )
+{
+    return s.noquote().nospace();
+}
+
+inline QDebug&
+operator<<( QDebug& s, const Quote& )
+{
+    return s.quote().space();
+}
+
 /**
  * @brief The full path of the log file.
  */