Allow Skybox to take a Color (#57)

This PR Adds the ability to set the color of the skybox using the URL
parameters.

- Now you can pass a color's hexadecimal number (without the #) in the
  skybox parameter, and that will set the skybox to that color.

studio-web/src/lib/studio.element.ts

@@ -2,7 +2,6 @@ import { inject } from "@storyteller/framework";
 import * as studio from "@storyteller/studio";
 import {
 	type InitOptions,
-	type SkyboxId,
 	StudioMode,
 	ViewportSize,
 } from "@storyteller/studio";
@@ -21,7 +20,7 @@ export class StudioElement extends LitElement {
 	@property() mixamoPath?: string;
 	@property() sceneImport?: string;
 	@property() storytellerScene?: string;
-	@property() skyboxId?: SkyboxId;
+	@property() skyboxId?: string;
 	@property({ type: Number }) mode?: StudioMode;
 
 	@inject(CANVAS_PROVIDER)

studio-web/src/lib/url-params.ts

@@ -1,4 +1,4 @@
-import { type SkyboxId, StudioMode } from "@storyteller/studio";
+import { StudioMode } from "@storyteller/studio";
 import { match } from "@storyteller/utility";
 
 export class StudioURLParams {
@@ -12,9 +12,7 @@ export class StudioURLParams {
 	get mixamo() { return this.#nativeParams.get("mixamo") ?? undefined; }
 	get sceneImport() { return this.#nativeParams.get("sceneImport") ?? undefined; }
 	get scene() { return this.#nativeParams.get("scene") ?? undefined; }
-	get skybox() {
-		return this.#nativeParams.get("skybox") as SkyboxId ?? undefined;
-	}
+	get skybox() { return this.#nativeParams.get("skybox") ?? undefined; }
 	get mode(): StudioMode {
 		return match(this.#nativeParams.get("mode"), {
 			"studio": () => StudioMode.Editor,