Add an option to only autobuy buildings that are not set up for auto-sell

[cheatfreak47]

It's annoying that you need to have autobuy building turned off if you use autosell building to get devastation buff, as leaving both on causes problems. It would be nice if you could add an option that disables autobuy for buildings that are currently being autosold. You could do this by either adding a second "on" option, something like "On (Ignore AutoSell Buildings)" or if you feel like it, you could also just expand the auto buy building option to allow you to manually blacklist specific buildings outright.