Seamless texture generation support for qwen image

[Phylliida]

Adds support for qwen image to generate seamless textures, using a -circular flag.

Requires this PR ggml-org/ggml#1374 for ggml that adds a "circular" mode that can be used.

I also had to tweak rope so the period of the sinusods would evenly tile.

./bin/sd  --diffusion-model /home/bepis/Documents/world/models/qwen-image-lighting-8steps-V1.0-Q4_K_S.gguf  --vae /home/bepis/Documents/world/models/qwen_image_vae.safetensors  --qwen2vl /home/bepis/Documents/world/models/Qwen2.5-VL-7B-Instruct-IQ4_XS.gguf --cfg-scale 2.5 --sampling-method euler -p "onion" --circular --seed 420

[Phylliida]

There's lots of conflicts, lemme fix those...