ui: tape: add form fields

this includes selectors for
* Allocation Policy
* Retention Policy
* Drives
* Changers
* Tape Device Paths
* Pools

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

www/tape/form/PoolSelector.js

@@ -0,0 +1,44 @@
+Ext.define('PBS.TapeManagement.PoolSelector', {
+    extend: 'Proxmox.form.ComboGrid',
+    alias: 'widget.pbsMediaPoolSelector',
+
+    allowBlank: false,
+    displayField: 'name',
+    valueField: 'name',
+    autoSelect: false,
+
+    store: {
+	proxy: {
+	    type: 'proxmox',
+	    url: '/api2/json/config/media-pool',
+	},
+	autoLoad: true,
+	sorters: 'name',
+    },
+
+    listConfig: {
+	columns: [
+	    {
+		text: gettext('Name'),
+		dataIndex: 'name',
+	    },
+	    {
+		text: gettext('Drive'),
+		dataIndex: 'drive',
+	    },
+	    {
+		text: gettext('Allocation'),
+		dataIndex: 'allocation',
+	    },
+	    {
+		text: gettext('Retention'),
+		dataIndex: 'retention',
+	    },
+	    {
+		text: gettext('Encryption Fingerprint'),
+		dataIndex: 'encryption',
+	    },
+	],
+    },
+});
+