QmlDesigner: 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: I492792bb9e5655c55795e938031efc557c9a462f
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/libs/qmljs/qmljslink.cpp

@@ -41,9 +41,10 @@
 #include <QDir>
 
 using namespace LanguageUtils;
-using namespace QmlJS;
 using namespace QmlJS::AST;
 
+namespace QmlJS {
+
 namespace {
 class ImportCacheKey
 {
@@ -76,8 +77,7 @@ bool operator==(const ImportCacheKey &i1, const ImportCacheKey &i2)
 }
 }
 
-
-class QmlJS::LinkPrivate
+class LinkPrivate
 {
 public:
     Snapshot snapshot;
@@ -602,3 +602,5 @@ void LinkPrivate::loadImplicitDefaultImports(Imports *imports)
         imports->append(import);
     }
 }
+
+} // namespace QmlJS