Move stream operator from AppEnum header

This PR will reduce the compile time of code using AppEnum. 

* AppEnum: Move QTextStream operator to avoid include of QTextStream
* Avoid use of iostream in cafAssert
rator to avoid include of QTextStream

Include file profiling shows that include of QTextStream is a performance issue. Create a non-templated base class for AppEnum. Implement the QTextStream operator for this interface.

ApplicationLibCode/Commands/ApplicationCommands/RicRunCommandFileFeature.cpp

@@ -25,6 +25,7 @@
 #include <QAction>
 #include <QDir>
 #include <QFileInfo>
+#include <QTextStream>
 
 CAF_CMD_SOURCE_INIT( RicRunCommandFileFeature, "RicRunCommandFileFeature" );