ASTC: re-compress to BC3 except huge arrays, which stay RGBA8 and trimmed

Title 1 has ~700 ASTC 8x8 textures (~280 MB as stored); decoded to RGBA8
they took ~4.5 GB, pushing Eden past the 8 GB of an RTX 4070 Laptop
(8.4-9.8 GB in use) and the texture cache into permanent aggressive
collection. With astc_recompression=Bc3 (CPU, asynchronous) they fit
(4.6-5.6 GB). The two 8192x8192x68 terrain arrays would still not fit as
BC3, so ASTC 2D arrays over 1 GiB as RGBA8 always use the GPU decoder with
trimmed levels (RGBA8 host image, UNORM/sRGB views), and the decoder pass
now exists whenever the GPU lacks native ASTC.

Also logs every 600 frames: device memory against the collector thresholds,
the largest images, totals by format, and buffer cache totals.

Title screen 65-150 s: 10.1 -> 16.0 fps.

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