fix (Qt) issues found by clang's clazy tool:

+ -Wclazy-incorrect-emit
+ -Wclazy-strict-iterators
+ -Wclazy-overloaded-signal
+ -Wclazy-qstring-arg
+ -Wclazy-unused-non-trivial-variable
+ -Wclazy-container-anti-pattern
+ -Wclazy-range-loop-reference
+ -Wclazy-const-signal-or-slot
+ -Wclazy-detaching-temporary
+ -Wclazy-qfileinfo-exists

src/Gui/NetworkRetriever.cpp

@@ -364,7 +364,7 @@ void NetworkRetriever::wgetFinished(int exitCode, QProcess::ExitStatus status)
         QByteArray data = wget->readAll();
         Base::Console().Warning(data);
     }
-    wgetExited();
+    Q_EMIT wgetExited();
 }
 
 /**