Comment 0 for bug 1380288

According to https://wl.widelands.org/docs/wl/autogen_wl_ui/#panel (in r7207), only windows, buttons and tabs can be accessed. But there are other elements that do not appear in any list:
- the priority buttons in production sites
- the hero/rookie preference
- the wares in the ware statistics window (and all similar windows)

It would be nice if those elements could be accessed (and maybe modified, too) via Lua scripting. This would allow more possibilities in the tutorials (warfare and economy, see https://code.launchpad.net/~widelands-dev/widelands/new-tutorials)