mass removal of rtl:: prefixes for O(U)String*

Modules sal, salhelper, cppu, cppuhelper, codemaker (selectively) and odk
have kept them, in order not to break external API (the automatic using declaration
is LO-internal).

Change-Id: I588fc9e0c45b914f824f91c0376980621d730f09

helpcompiler/source/HelpCompiler.cxx

@@ -497,7 +497,7 @@ namespace fs
     {
         HCDBG(
             std::cerr << "creating " <<
-            rtl::OUStringToOString(indexDirName.data, RTL_TEXTENCODING_UTF8).getStr()
+            OUStringToOString(indexDirName.data, RTL_TEXTENCODING_UTF8).getStr()
             << std::endl
            );
         osl::Directory::createPath(indexDirName.data);