Issue#3064 html alert title message (#3065)

Fixes [#3064](https://github.com/MichMich/MagicMirror/issues/3064)

- Fixes default alert module nunjucks templates to render HTML by
default unless 'titleType' and 'messageType' are set to 'text' in the
payload data

e.g. 

Display Text:
`this.sendNotification('SHOW_ALERT', {type: "notification", title:
"<u>YoLink LeakSensor</u>", titleType: "text", message: "<b>" +
deviceName + "</b> reported an alarm that needs attention.",
messageType: "text"});`

Display HTML:
`this.sendNotification('SHOW_ALERT', {type: "notification", title:
"<u>YoLink LeakSensor</u>", message: "<b>" + deviceName + "</b> reported
an alarm that needs attention."});`

modules/default/alert/templates/alert.njk

@@ -8,11 +8,11 @@
   <br/>
 {% endif %}
 {% if title %}
-  <span class="thin dimmed medium">{{ title }}</span>
+  <span class="thin dimmed medium">{{ title if titleType == 'text' else title | safe }}</span>
 {% endif %}
 {% if message %}
   {% if title %}
     <br/>
   {% endif %}
-  <span class="light bright small">{{ message | safe }}</span>
+  <span class="light bright small">{{ message if messageType == 'text' else message | safe }}</span>
 {% endif %}

modules/default/alert/templates/notification.njk

@@ -1,9 +1,9 @@
 {% if title %}
-  <span class="thin dimmed medium">{{ title }}</span>
+  <span class="thin dimmed medium">{{ title if titleType == 'text' else title | safe }}</span>
 {% endif %}
 {% if message %}
   {% if title %}
     <br/>
   {% endif %}
-  <span class="light bright small">{{ message | safe }}</span>
+  <span class="light bright small">{{ message if messageType == 'text' else message | safe }}</span>
 {% endif %}