C++: Remove unneeded qualifications

Mostly done using the following ruby script:
Dir.glob('**/*.cpp').each { |file|
  next if file =~ %r{src/shared/qbs|/qmljs/}
  s = File.read(file)
  s.scan(/^using namespace (.*);$/) {
    ns = $1
    t = s.gsub(/^(.*)\b#{ns}::((?!Const)[A-Z])/) { |m|
      before = $1
      char = $2
      if before =~ /"|\/\/|\\|using|SIGNAL|SLOT|Q_/
        m
      else
        before + char
      end
    }
    if t != s
      puts file
      File.open(file, 'w').write(t)
    end
  }
}

Change-Id: I6fbe13ddc1485efe95c3156097bf41d90c0febac
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/plugins/cpptools/insertionpointlocator.cpp

@@ -497,7 +497,7 @@ static InsertionLocation nextToSurroundingDefinitions(Symbol *declaration,
         return noResult;
 
     // scan preceding declarations for a function declaration (and see if it is defined)
-    CppTools::SymbolFinder symbolFinder;
+    SymbolFinder symbolFinder;
     Function *definitionFunction = 0;
     QString prefix, suffix;
     Declaration *surroundingFunctionDecl = 0;
@@ -572,7 +572,7 @@ QList<InsertionLocation> InsertionPointLocator::methodDefinition(Symbol *declara
         return result;
 
     if (useSymbolFinder) {
-        CppTools::SymbolFinder symbolFinder;
+        SymbolFinder symbolFinder;
         if (symbolFinder.findMatchingDefinition(declaration, m_refactoringChanges.snapshot(), true))
             return result;
     }