Debugger: 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: I1aa1a2b6ccbafeb1a8f3053fffa39b3f96992591
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/debugger/debuggeroptionspage.cpp

@@ -92,7 +92,7 @@ public:
 // DebuggerItemModel
 // --------------------------------------------------------------------------
 
-class DebuggerItemModel : public Utils::TreeModel
+class DebuggerItemModel : public TreeModel
 {
     Q_DECLARE_TR_FUNCTIONS(Debugger::DebuggerOptionsPage)