Feature/200 beastform (#255)

* Temp

* Dialog setup

* Fixed basic beastform

* Reworked beastform to hold it's data entirely in the beastformEffect

* UpdateActorTokens fix

* Removed hardcoded tierlimit on beastform

* PR fixes

module/dialogs/beastformDialog.mjs

@@ -0,0 +1,86 @@
+import { tiers } from '../config/generalConfig.mjs';
+
+const { ApplicationV2, HandlebarsApplicationMixin } = foundry.applications.api;
+
+export default class BeastformDialog extends HandlebarsApplicationMixin(ApplicationV2) {
+    constructor(configData) {
+        super();
+
+        this.configData = configData;
+        this.selected = null;
+    }
+
+    static DEFAULT_OPTIONS = {
+        tag: 'form',
+        classes: ['daggerheart', 'views', 'dh-style', 'beastform-selection'],
+        position: {
+            width: 600,
+            height: 'auto'
+        },
+        actions: {
+            selectBeastform: this.selectBeastform,
+            submitBeastform: this.submitBeastform
+        },
+        form: {
+            handler: this.updateBeastform,
+            submitOnChange: true,
+            submitOnClose: false
+        }
+    };
+
+    get title() {
+        return game.i18n.localize('DAGGERHEART.Sheets.Beastform.dialogTitle');
+    }
+
+    /** @override */
+    static PARTS = {
+        beastform: {
+            template: 'systems/daggerheart/templates/views/beastformDialog.hbs'
+        }
+    };
+
+    async _prepareContext(_options) {
+        const context = await super._prepareContext(_options);
+
+        context.beastformTiers = game.items.reduce((acc, x) => {
+            const tier = tiers[x.system.tier];
+            if (x.type !== 'beastform' || tier.value > this.configData.tierLimit) return acc;
+
+            if (!acc[tier.value]) acc[tier.value] = { label: game.i18n.localize(tier.label), values: {} };
+            acc[tier.value].values[x.uuid] = { selected: this.selected == x.uuid, value: x };
+
+            return acc;
+        }, {}); // Also get from compendium when added
+        context.canSubmit = this.selected;
+
+        return context;
+    }
+
+    static updateBeastform(event, _, formData) {
+        this.selected = foundry.utils.mergeObject(this.selected, formData.object);
+
+        this.render();
+    }
+
+    static selectBeastform(_, target) {
+        this.selected = this.selected === target.dataset.uuid ? null : target.dataset.uuid;
+        this.render();
+    }
+
+    static async submitBeastform() {
+        await this.close({ submitted: true });
+    }
+
+    /** @override */
+    _onClose(options = {}) {
+        if (!options.submitted) this.config = false;
+    }
+
+    static async configure(configData) {
+        return new Promise(resolve => {
+            const app = new this(configData);
+            app.addEventListener('close', () => resolve(app.selected), { once: true });
+            app.render({ force: true });
+        });
+    }
+}