feat: add preset selection to Gradio UI (session based) (#1570)

* add preset selection

uses meta parsing to set presets in user session (UI elements only)

* add LoRA handling

* use default config as fallback value

* add preset refresh on "Refresh All Files" click

* add special handling for default_styles and default_aspect_ratio

* sort styles after preset change

* code cleanup

* download missing models from preset

* set default refiner to "None" in preset realistic

* use state_is_generating for preset selection change

* DRY output parameter handling

* feat: add argument --disable-preset-selection

useful for cloud provisioning to prevent model switches and keep models loaded

* feat: keep prompt when not set in preset, use more robust syntax

* fix: add default return values when preset download is disabled

https://github.com/mashb1t/Fooocus/issues/20

* feat: add translation for preset label

* refactor: unify preset loading methods in config

* refactor: code cleanup

presets/realistic.json

@@ -1,6 +1,6 @@
 {
     "default_model": "realisticStockPhoto_v20.safetensors",
-    "default_refiner": "",
+    "default_refiner": "None",
     "default_refiner_switch": 0.5,
     "default_loras": [
         [