Function godotAssertHandlerEditorDebug

The debug-mode Godot-D assert handler redirects assert messages to the Godot error handlers (including Debugger tab in editor and system console).

void godotAssertHandlerEditorDebug (
  string file,
  ulong line,
  string msg
);

Unlike the default D assert handler, this one doesn't terminate the program, allowing the messages to remain in Godot's Debugger tab and matching how Godot error macros behave.