ResourcesConfigWindow: removing unnecesary field from main class
CordobaZombie0.1: commit from wrong branch, adding sound to buttons.

I did this from here because branch cordobazombie0.1 had recently been merged
with this one (resources_config_window), and since we're close to deployment
I didn't want to break things in the main branch.

AGUS: if changes are correct please merge this to cordobazombie0.1