Macros: Remove Q_OBJECT macro from some classes that don't need it

Plus some code cosmetics.

Change-Id: Ifa9c4e7322ae7a2d5c1480f7afc58f020efcbc1c
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/macros/findmacrohandler.cpp

@@ -13,10 +13,10 @@
 
 #include <aggregation/aggregate.h>
 
-using namespace Macros;
-using namespace Macros::Internal;
 using namespace Utils;
 
+namespace Macros::Internal {
+
 static const char EVENTNAME[] = "Find";
 static const quint8 TYPE = 0;
 static const quint8 BEFORE = 1;
@@ -202,3 +202,5 @@ void FindMacroHandler::startRecording(Macro* macro)
     if (current)
         changeEditor(current);
 }
+
+} // namespace Macros::Internal