Some preparations for activity log.

Fixed issue #524
Table now displays horizontal scrollbar when the viewport is too narrow (typically on mobile)

server/lib/activity-log.js

@@ -0,0 +1,55 @@
+'use strict';
+
+async function _logActivity(typeId, data) {
+    // TODO
+}
+
+/*
+Extra data:
+
+campaign:
+- status : CampaignStatus
+
+list:
+- subscriptionId
+- subscriptionStatus : SubscriptionStatus
+- fieldId
+- segmentId
+- importId
+- importStatus : ImportStatus
+*/
+async function logEntityActivity(entityTypeId, activityType, entityId, extraData = {}) {
+    const data = {
+        ...extraData,
+        type: activityType,
+        entity: entityId
+    };
+
+    await _logActivity(entityTypeId, data);
+}
+
+async function logCampaignTrackerActivity(activityType, campaignId, listId, subscriptionId, extraData = {}) {
+    const data = {
+        ...extraData,
+        type: activityType,
+        campaign: campaignId,
+        list: listId,
+        subscription: subscriptionId
+    };
+
+    await _logActivity('campaign_tracker', data);
+}
+
+async function logBlacklistActivity(activityType, email) {
+    const data = {
+        ...extraData,
+        type: activityType,
+        email
+    };
+
+    await _logActivity('blacklist', data);
+}
+
+module.exports.logEntityActivity = logEntityActivity;
+module.exports.logBlacklistActivity = logBlacklistActivity;
+module.exports.logCampaignTrackerActivity = logCampaignTrackerActivity;