logic: Moved update check setting to preferences and enable automatic update check by default

bin/app/data/gui/startscreen/startscreen.css

@@ -53,9 +53,9 @@
 	text-decoration: underline;
 }
 
-#updateCheckbox {
+#updateButton:disabled {
 	color: black;
-	font-size: 12px;
+	text-decoration: none;
 }
 
 #licenseHeaderLabel {

bin/app/user/ApplicationSettings_template.xml

@@ -86,6 +86,7 @@
 			<automatic><!-- BOOL: whether to check automatically for new software updates --></automatic>
 			<time_stamp><!-- TIME: time of the last update check --></time_stamp>
 			<skip_version><!-- VERSION: version to skip for update --></skip_version>
+			<url><!-- STRING: url to new version download --></url>
 		</update_check>
 	</user>