The game uses DXGI_FORMAT_R8G8B8A8_SNORM when building the D3D11
input-layout for what CW called Dec3N.
Updated XML import/export to correctly read these values.
When a drawable hash was unknown, it kept the "filename.#dd" name so
exporting to XML lost the hash and importing it back created a broken
file.
Now if the hash is unknown, the name is set to `hash_1234ABCD`, and XML
import checks for `hash_`.