Add support to msapplication oembed metadata

Closes #5614

packages/rocketchat-oembed/client/oembedUrlWidget.coffee

@@ -34,7 +34,7 @@ Template.oembedUrlWidget.helpers
 
 		decodedOgImage = @meta.ogImage?.replace?(/&/g, '&')
 
-		url = decodedOgImage or this.meta.twitterImage
+		url = this.meta.msapplicationTileImage or decodedOgImage or this.meta.twitterImage
 
 		if not url?
 			return

packages/rocketchat-oembed/server/server.coffee

@@ -204,7 +204,7 @@ getRelevantHeaders = (headersObj) ->
 getRelevantMetaTags = (metaObj) ->
 	tags = {}
 	for key, value of metaObj
-		if /^(og|fb|twitter|oembed).+|description|title|pageTitle$/.test(key.toLowerCase()) and value?.trim() isnt ''
+		if /^(og|fb|twitter|oembed|msapplication).+|description|title|pageTitle$/.test(key.toLowerCase()) and value?.trim() isnt ''
 			tags[key] = value
 
 	if Object.keys(tags).length > 0