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/applications/sheets/items/beastform.mjs

@@ -0,0 +1,65 @@
+import DHBaseItemSheet from '../api/base-item.mjs';
+
+export default class BeastformSheet extends DHBaseItemSheet {
+    /**@inheritdoc */
+    static DEFAULT_OPTIONS = {
+        classes: ['beastform'],
+        dragDrop: [{ dragSelector: null, dropSelector: '.drop-section' }],
+        actions: {
+            editFeature: this.editFeature,
+            removeFeature: this.removeFeature
+        }
+    };
+
+    /**@override */
+    static PARTS = {
+        header: { template: 'systems/daggerheart/templates/sheets/items/beastform/header.hbs' },
+        tabs: { template: 'systems/daggerheart/templates/sheets/global/tabs/tab-navigation.hbs' },
+        settings: { template: 'systems/daggerheart/templates/sheets/items/beastform/settings.hbs' },
+        features: {
+            template: 'systems/daggerheart/templates/sheets/global/tabs/tab-features.hbs',
+            scrollable: ['.features']
+        },
+        effects: {
+            template: 'systems/daggerheart/templates/sheets/global/tabs/tab-effects.hbs',
+            scrollable: ['.effects']
+        }
+    };
+
+    static TABS = {
+        primary: {
+            tabs: [{ id: 'settings' }, { id: 'features' }, { id: 'effects' }],
+            initial: 'settings',
+            labelPrefix: 'DAGGERHEART.Sheets.TABS'
+        }
+    };
+
+    /**@inheritdoc */
+    async _preparePartContext(partId, context) {
+        await super._preparePartContext(partId, context);
+
+        return context;
+    }
+
+    static editFeature(event) {
+        const target = event.target.closest('[data-action="editFeature"]');
+        const feature = this.document.system.features[target.dataset.index];
+        feature.sheet.render({ force: true });
+    }
+
+    static async removeFeature(_, target) {
+        const current = this.document.system.features.map(x => x.uuid);
+        await this.document.update({
+            'system.features': current.filter((_, index) => index !== Number(target.dataset.index))
+        });
+    }
+
+    async _onDrop(event) {
+        const data = TextEditor.getDragEventData(event);
+        const item = await fromUuid(data.uuid);
+        if (item.type === 'feature') {
+            const current = this.document.system.features.map(x => x.uuid);
+            await this.document.update({ 'system.features': [...current, item.uuid] });
+        }
+    }
+}