Iopaint

fix sd1.5 inpainting size bug

- Add stable-diffusion-inpainting model(sd.5) from https://github.com/runwayml/stable-diffusion. Compared to sd1.4 it has better results
- new example video 🎉

https://user-images.githubusercontent.com/3998421/196976498-ba1ad3ab-fa18-4c55-965f-5c6683141375.mp4

1. Bug Fix: correctly pass cv2 config to the server
2. Feature: press alt/opt and move the mouse left/right to change brush size


https://user-images.githubusercontent.com/3998421/194760412-581eaa69-12bf-4f33-b8fa-d89d131d1a23.mov

1. Remove the landing page, now you can direct drag the image to the editor

https://user-images.githubusercontent.com/3998421/194713446-c22e8320-1f12-4910-814b-ae2b0f1a3ade.mov


https://user-images.githubusercontent.com/3998421/194713757-21b637a1-fc5d-408a-987b-337627a3f33b.mov




2. Use `ctrl+v` to paste an image to the editor

https://user-images.githubusercontent.com/3998421/194713285-0dd5b826-46f7-44d8-b228-8d395d68fdc6.mov

Add three args for `sd1.4`

| Name | Description | Default |
|-------------------|-------------------------------------------------------------------------------------------------------------------------------| -------- |
| --sd-run-local | Once the model are downloaded, you can pass this arg and remove `--hf_access_token` | |
| --sd-disable-nsfw | Disable stable-diffusion NSFW checker. | |
| --sd-cpu-textencoder | Always run stable-diffusion TextEncoder model on CPU. | |

fix sd inpainting bug, currently diffusers only support mod 64 forward: https://github.com/huggingface/diffusers/pull/505