fix typo invalid for loop end
Add cloud menu background by Krisi, configurable with the menu_clouds option.
Also add a menuheader, menusplash, menufooter_clouds, and allow HD menu footers.
And finally don't git-ignore textures/base/.
Remove 'tape and glue', update Credits tab
Liquid fine tuning
Optimize Mapgen::updateLighting(), add setLighting()