refactor: move impl into .cpp + fix include paths

src/webutil/HttpEndpointDescr.cpp

@@ -0,0 +1,27 @@
+/* @file HttpEndpointDescr.cpp */
+
+#include "HttpEndpointDescr.hpp"
+#include "xo/indentlog/print/tag.hpp"
+#include "xo/indentlog/print/tostr.hpp"
+
+namespace xo {
+    namespace web {
+        HttpEndpointDescr::HttpEndpointDescr(std::string uri_pattern,
+                                             HttpEndpointFn endpoint_fn)
+            : uri_pattern_{std::move(uri_pattern)},
+              endpoint_fn_{std::move(endpoint_fn)}
+        {}
+
+        void
+        HttpEndpointDescr::display(std::ostream & os) const {
+            os << "<HttpEndpointDescr" << xtag("uri_pattern", uri_pattern_) << ">";
+        } /*display*/
+
+        std::string
+        HttpEndpointDescr::display_string() const { return tostr(*this); }
+    } /*namespace web*/
+
+} /*namespace xo*/
+
+
+/* end HttpEndpointDescr.cpp */