Codechange: Make all NWidgetPart arrays constexpr.

This ensures that the arrays are not created at runtime and prevents using non-constexpr values.

src/console_gui.cpp

@@ -98,7 +98,7 @@ static inline void IConsoleResetHistoryPos()
 static const char *IConsoleHistoryAdd(const char *cmd);
 static void IConsoleHistoryNavigate(int direction);
 
-static const NWidgetPart _nested_console_window_widgets[] = {
+static constexpr NWidgetPart _nested_console_window_widgets[] = {
 	NWidget(WWT_EMPTY, INVALID_COLOUR, WID_C_BACKGROUND), SetResize(1, 1),
 };