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/RetentionSelector.js

@@ -0,0 +1,26 @@
+Ext.define('PBS.TapeManagement.RetentionStore', {
+    extend: 'Ext.data.Store',
+    alias: 'store.retentionCalendarEventStore',
+
+    field: ['value', 'text'],
+    data: [
+	{ value: 'overwrite', text: gettext('Overwrite') },
+	{ value: 'keep', text: gettext('Keep') },
+	{ value: '120 minutes', text: Ext.String.format(gettext("{0} minutes"), 120) },
+	{ value: '12 hours', text: Ext.String.format(gettext("{0} hours"), 12) },
+	{ value: '7 days', text: Ext.String.format(gettext("{0} days"), 7) },
+	{ value: '4 weeks', text: Ext.String.format(gettext("{0} weeks"), 4) },
+	{ value: '6 months', text: Ext.String.format(gettext("{0} months"), 6) },
+	{ value: '2 years', text: Ext.String.format(gettext("{0} years"), 2) },
+    ],
+});
+
+Ext.define('PBS.TapeManagement.RetentionSelector', {
+    extend: 'PBS.form.CalendarEvent',
+    alias: 'widget.pbsRetentionSelector',
+
+    store: {
+	type: 'retentionCalendarEventStore',
+    },
+});
+