0029310: Coding - multiple compiler warnings in Inspectors

1. Added specific header files to disable and restore compiler warnings: Standard_WarningsDisable.hxx, Standard_WarningsRestore.hxx.
   (Currently only MSVC compiler is handled.)
2. Inspector: compiler warnings are disabled for all includes of Qt headers.
3. Inspector: minor code correction to avoid warning due to use of floating point values in integer calculations.

tools/ShapeView/ShapeView_OpenFileDialog.hxx

@@ -20,12 +20,11 @@
 #include <Standard_Macro.hxx>
 #include <TCollection_AsciiString.hxx>
 
-#ifdef _MSC_VER
-#pragma warning(disable : 4127) // conditional expression is constant
-#endif
+#include <Standard_WarningsDisable.hxx>
 #include <QDialog>
 #include <QItemSelection>
 #include <QStringList>
+#include <Standard_WarningsRestore.hxx>
 
 #include <map>