Codefix: initialise a few uninitialised variables

src/textfile_gui.cpp

@@ -251,7 +251,7 @@ void TextfileWindow::FindHyperlinksInMarkdown(Line &line, size_t line_index)
 	while (matcher != std::sregex_iterator()) {
 		std::smatch match = *matcher;
 
-		Hyperlink link;
+		Hyperlink link{};
 		link.line = line_index;
 		link.destination = match[2].str();
 		this->links.push_back(link);

src/textfile_gui.h

@@ -54,10 +54,10 @@ protected:
 	};
 
 	struct Hyperlink {
-		size_t line;             ///< Which line the link is on.
-		size_t begin;            ///< Character position on line the link begins.
-		size_t end;              ///< Character position on line the link end.
-		std::string destination; ///< Destination for the link.
+		size_t line = 0; ///< Which line the link is on.
+		size_t begin = 0; ///< Character position on line the link begins.
+		size_t end = 0; ///< Character position on line the link end.
+		std::string destination{}; ///< Destination for the link.
 	};
 
 	struct HistoryEntry {

src/town_cmd.cpp

@@ -857,7 +857,7 @@ static void AddAcceptedCargo_Town(TileIndex tile, CargoArray &acceptance, CargoT
  */
 CargoArray GetAcceptedCargoOfHouse(const HouseSpec *hs)
 {
-	CargoTypes always_accepted;
+	CargoTypes always_accepted{};
 	CargoArray acceptance{};
 	AddAcceptedCargoOfHouse(INVALID_TILE, hs->Index(), hs, nullptr, acceptance, always_accepted);
 	return acceptance;