new: [widget] Eventstream widget and index widget UI added

- EventStream
  - add a lightweight event index to your dashboard
  - configure filters for the events you're interested in (tags, orgs, published)
  - set the number of events to display (limit)
  - set the list of fields it should display (id, orgc, info, tags, threat_level, analysis, date)

- Index widget UI
  - uses the generic index builder
  - build simple index like UIs

app/Lib/Dashboard/EventStreamWidget.php

@@ -0,0 +1,95 @@
+<?php
+
+class EventStreamWidget
+{
+    public $title = 'Event Stream';
+    public $render = 'Index';
+    public $width = 4;
+    public $height = 2;
+    public $params = [
+        'tags' => 'A list of tagnames to filter on. Comma separated list, prepend each tag with an exclamation mark to negate it.',
+        'orgs' => 'A list of organisation names to filter on. Comma separated list, prepend each tag with an exclamation mark to negate it.',
+        'published' => 'Boolean flag to filter on published events only',
+        'limit' => 'How many events should be listed? Defaults to 5',
+        'fields' => 'A list of fields that should be displayed. Valid fields: id, orgc, info, tags, threat_level, analysis, date. Default field selection ["id", "orgc", "info"]'
+    ];
+    public $description = 'Monitor incoming events based on your own filters.';
+    public $cacheLifetime = false;
+    public $autoRefreshDelay = 5;
+    private $__default_fields = ['id', 'orgc', 'info'];
+
+	public function handler($user, $options = array())
+	{
+        $this->Event = ClassRegistry::init('Event');
+        $params = [
+            'metadata' => 1,
+            'limit' => 5,
+            'page' => 1,
+            'order' => 'Event.id DESC'
+        ];
+        $field_options = [
+            'id' => [
+                'name' => '#',
+                'url' => Configure::read('MISP.baseurl') . '/events/view',
+                'element' => 'links',
+                'data_path' => 'Event.id',
+                'url_params_data_paths' => 'Event.id'
+            ],
+            'orgc' => [
+                'name' => 'Org',
+                'data_path' => 'Orgc',
+                'element' => 'org'
+            ],
+            'info' => [
+                'name' => 'Info',
+                'data_path' => 'Event.info',
+            ],
+            'tags' => [
+                'name' => 'Tags',
+                'data_path' => 'EventTag',
+                'element' => 'tags',
+                'scope' => 'feeds'
+            ],
+            'threat_level' => [
+                'name' => 'Threat Level',
+                'data_path' => 'ThreatLevel.name'
+            ],
+            'analysis' => [
+                'name' => 'Analysis',
+                'data_path' => 'Event.analysis',
+                'element' => 'array_lookup_field',
+                'arrayData' => [__('Initial'), __('Ongoing'), __('Complete')]
+            ],
+            'date' => [
+                'name' => 'Date',
+                'data_path' => 'Event.date'
+            ],
+        ];
+        $fields = [];
+        if (empty($options['fields'])) {
+            $options['fields'] = $this->__default_fields;
+        }
+        foreach ($options['fields'] as $field) {
+            if (!empty($field_options[$field])) {
+                $fields[] = $field_options[$field];
+            }
+        }
+        foreach (['published', 'limit', 'tags', 'orgs'] as $field) {
+            if (!empty($options[$field])) {
+                $params[$field] = $options[$field];
+            }
+        }
+        $data = $this->Event->fetchEvent($user, $params);
+        return [
+            'data' => $data,
+            'fields' => $fields
+        ];
+	}
+
+    public function checkpermissions($user) {
+        if (in_array($user['id'], [1, 2, 3])) {
+            return true;
+        }
+        return false;
+    }
+}

app/View/Elements/dashboard/Widgets/Index.ctp

@@ -0,0 +1,14 @@
+<?php
+    echo $this->element('genericElements/IndexTable/index_table', [
+        'data' => [
+            'data' => $data['data'],
+            'top_bar' => [],
+            'fields' => $data['fields'],
+            'title' => false,
+            'description' => false,
+            'pull' => 'right',
+            'skip_pagination' => true,
+            'actions' => []
+        ]
+    ]);
+?>