Add datasheet for sync sheets

module/hooks/devInit.mjs

@@ -3,6 +3,7 @@ Initialization of dev-specific features for the init hook, this is primarily
 used to register all of the data sheets of various entity types.
 */
 
+import { GroupDataSheet } from "../sheets/Datasheets/GroupDataSheet.mjs";
 import { UntypedDataSheet } from "../sheets/Datasheets/UntypedDataSheet.mjs";
 
 export function devInit() {
@@ -11,7 +12,16 @@ export function devInit() {
 		UntypedDataSheet,
 		{
 			types: [`untyped`, `foil`],
-			label: `dotdungeon.sheet-names.UntypedDataSheet`,
+			label: `dotdungeon.sheet-names.*DataSheet`,
+		}
+	);
+
+	Actors.registerSheet(
+		`dotdungeon`,
+		GroupDataSheet,
+		{
+			types: [`sync`],
+			label: `dotdungeon.sheet-names.*DataSheet`,
 		}
 	);
 };

module/sheets/Datasheets/GroupDataSheet.mjs

@@ -0,0 +1,31 @@
+export class GroupDataSheet extends ActorSheet {
+	static get defaultOptions() {
+		let opts = foundry.utils.mergeObject(
+			super.defaultOptions,
+			{
+				template: `systems/dotdungeon/templates/datasheets/actor/group.hbs`,
+				width: 200,
+				height: 275
+			},
+		);
+		opts.classes.push(`dotdungeon`, `style-v3`);
+		return opts;
+	};
+
+	async getData() {
+		const ctx = {};
+
+		ctx.actor = this.actor;
+		ctx.system = this.actor.system;
+
+		ctx.computed = {
+			milestones_hit_viewable: [...this.actor.system.milestones_hit.values()].join(`, `)
+		}
+
+		ctx.meta = {
+			idp: this.actor.uuid,
+		};
+
+		return ctx;
+	};
+};