Integrate Stable Diffusion with the Imaginate layer (#784)

* Add AI Artist layer

* WIP add a button to download the rendered folder under an AI Artist layer

* Successfully download the correct image

* Break out image downloading JS into helper function

* Change file download from using data URLs to blob URLs

* WIP rasterize to blob

* Remove dimensions from AI Artist layer

* Successfully draw rasterized image on layer after calculation

* Working txt2img generation based on user prompt

* Add img2img and the main parameters

* Fix ability to rasterize multi-depth documents with blob URL images by switching them to base64

* Fix test

* Rasterize with artboard background color

* Allow aspect ratio stretch of AI Artist images

* Add automatic resolution choosing

* Add a terminate button, and make the lifecycle more robust

* Add negative prompt

* Add range bounds for parameter inputs

* Add seed

* Add tiling and restore faces

* Add server status check, server hostname customization, and resizing layer to fit AI Artist resolution

* Fix background color of infinite canvas rasterization

* Escape prompt text sent in the JSON

* Revoke blob URLs when cleared/replaced to reduce memory leak

* Fix welcome screen logo color

* Add PreferencesMessageHandler

* Add persistent storage of preferences

* Fix crash introduced in previous commit when moving mouse on page load

* Add tooltips to the AI Artist layer properties

* Integrate AI Artist tool into the raster section of the tool shelf

* Add a refresh button to the connection status

* Fix crash when generating and switching to a different document tab

* Add persistent image storage to AI Artist layers and fix duplication bugs

* Add a generate with random seed button

* Simplify and standardize message names

* Majorly improve robustness of networking code

* Fix race condition causing default server hostname to show disconnected when app loads with AI Artist layer selected (probably, not confirmed fixed)

* Clean up messages and function calls by changing arguments into structs

* Update API to more recent server commit

* Add support for picking the sampling method

* Add machinery for filtering selected layers with type

* Replace placeholder button icons

* Improve the random icon by tilting the dice

* Use selected_layers() instead of repeating that code

* Fix borrow error

* Change message flow in progress towards fixing #797

* Allow loading image on non-active document (fixes #797)

* Reduce code duplication with rasterization

* Add AI Artist tool and layer icons, and remove ugly node layer icon style

* Rename "AI Artist" codename to "Imaginate" feature name

Co-authored-by: otdavies <oliver@psyfer.io>
Co-authored-by: 0hypercube <0hypercube@gmail.com>

editor/src/test_utils.rs

@@ -2,7 +2,7 @@ use crate::application::set_uuid_seed;
 use crate::application::Editor;
 use crate::messages::input_mapper::utility_types::input_keyboard::ModifierKeys;
 use crate::messages::input_mapper::utility_types::input_mouse::{EditorMouseState, MouseKeys, ScrollDelta, ViewportPosition};
-use crate::messages::portfolio::document::utility_types::misc::Platform;
+use crate::messages::portfolio::utility_types::Platform;
 use crate::messages::prelude::*;
 use crate::messages::tool::utility_types::ToolType;