Replace log debugging output with tracing.

Replace all instances of wxLogDebug with wxLogTrace in the common and
kicad folders to prevent unwanted debugging output.

Add new trace flags for locale and screen object tracing.

The usual smattering of code policy fixes.

common/search_stack.cpp

@@ -2,7 +2,7 @@
  * This program source code file is part of KiCad, a free EDA CAD application.
  *
  * Copyright (C) 2014 CERN
- * Copyright (C) 2014-2015 KiCad Developers, see CHANGELOG.TXT for contributors.
+ * Copyright (C) 2014-2018 KiCad Developers, see CHANGELOG.TXT for contributors.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -24,9 +24,9 @@
 
 #include <macros.h>
 #include <search_stack.h>
+#include <trace_helpers.h>
 #include <wx/tokenzr.h>
 
-
 #if defined(__MINGW32__)
  #define PATH_SEPS          wxT( ";\r\n" )
 #else
@@ -200,11 +200,11 @@ const wxString SEARCH_STACK::LastVisitedPath( const wxString& aSubPathToSearch )
 #if defined(DEBUG)
 void SEARCH_STACK::Show( const wxString& aPrefix ) const
 {
-    wxLogDebug( wxT( "%s SEARCH_STACK:" ), GetChars( aPrefix ) );
+    wxLogTrace( tracePathsAndFiles, "%s SEARCH_STACK:", aPrefix );
 
     for( unsigned i=0;  i<GetCount();  ++i )
     {
-        wxLogDebug( wxT( "  [%2u]:%s" ), i, TO_UTF8( (*this)[i] ) );
+        wxLogTrace( tracePathsAndFiles, "  [%2u]:%s", i, TO_UTF8( (*this)[i] ) );
     }
 }
 #endif