Stop using cv2pdb and improve HTTP handling a little

luprex/cpp/core/http.hpp

@@ -421,6 +421,13 @@ public:
     // Synthesize an error and store it in lua.
     //
     static void store_fail(LuaCoreStack &LS, LuaSlot tab, int status, std::string_view error);
+
+    // Convert a path component into a lua identifier.
+    //
+    // Returns the empty string if the path component cannot be converted
+    // to a lua identifier.
+    //
+    static eng::string to_lua_identifier(std::string_view pathcomp);
 };
 
 class HttpClientRequestMap : public eng::map<int64_t, HttpClientRequest> {