st/nine: Implement NineDevice9_GetAvailableTextureMem

st/nine: Implement NineDevice9_GetAvailableTextureMem

Implement a device private memory counter similar to Win 7.

Only textures and surfaces increment vidmem and may return
ERR_OUTOFVIDEOMEMORY. Vertexbuffers and indexbuffers creation always
succeedes, even when out of video memory.

Fixes "Vampire: The Masquerade - Bloodlines" allocating resources until crash.
Fixes "Age of Conan" allocating resources until crash.
Fixes failing WINE test device.c test_vidmem_accounting().

Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Axel Davy <axel.davy@ens.fr>