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

codemaker/source/cppumaker/cppuoptions.cxx

@@ -24,9 +24,6 @@
 #include "osl/thread.h"
 #include "osl/process.h"
 
-using ::rtl::OUString;
-using ::rtl::OUStringToOString;
-using ::rtl::OString;
 
 #ifdef SAL_UNX
 #define SEPARATOR '/'