c++ API: use css alias in generated headers, adds global css decl

This changes all generated API headers (.hpp and .hdl) to use a
namespace alias 'css' instead of the pointlessly long com::sun::star

Makes the change in cppumaker & associated tools, adds a global
namespace alias definition in sal/types.h, and removes a kiloton
of local, now pointless-to-harmful versions of that alias from all
over the code.

Change-Id: Ice5a644a6b971a981f01dc0589d48f5add31cc0f

cppu/source/threadpool/thread.cxx

@@ -31,12 +31,6 @@
 #include "jobqueue.hxx"
 #include "threadpool.hxx"
 
-namespace {
-
-namespace css = com::sun::star;
-
-}
-
 using namespace osl;
 
 namespace cppu_threadpool {