freedoom/attic: Old Freedoom resources never die, they just get put in the attic

镜像来自 https://github.com/freedoom/attic

Georgy Samoilov 473cfff763 Add low contrast rw18, rename some files		4 月之前
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silver0.png	473cfff763 Add low contrast rw18, rename some files	4 月之前
silver1.png	473cfff763 Add low contrast rw18, rename some files	4 月之前