indentlog: refactor: move stream-inserters to print/ subdir

include/indentlog/printer.hpp

@@ -1,28 +0,0 @@
-/* @file printer.hpp */
-
-#pragma once
-
-#include <utility>
-
-namespace xo {
-  namespace print {
-    /* print an event to a logfile
-     * intended to be usable as EventSink argument
-     * to RealizationSimSource<T, EventSink>
-     */
-    template<typename T, typename Stream>
-    class printer {
-    public:
-      printer(Stream && os) : os_{std::move(os)} {}
-
-      void operator()(T const & x) {
-          this->os_ << x;
-      }
-
-    private:
-      Stream os_;
-    }; /*printer*/
-  } /*namespace print*/
-} /*namespace xo*/
-
-/* end printer.hpp */