Update to Vaadin to version 8.5.2

Description

Update to the latest vaadin version, as of now it is 7.5.1 (2015-07-14) 7.6.4 (2016-03-09)

Update Vaadin to Version 8.5.2

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Markus von Rüden November 7, 2018 at 8:57 AM

Originally the goals was to migrate to the latest Vaadin Version. However that is now 11 something, which is no longer compatible with our code base. 

The latest API version which our code base is compatible to is Vaadin 8. 

While working on this issue, Vaadin 8.6.0 was released. 

Therefore this issue only tackles migrating to 8.5.2.

PR: https://github.com/OpenNMS/opennms/pull/2224

The Working branch was jira/NMS-7797-2018. The 2018 inidicating the year 2018 and not a foundation branch

Markus von Rüden July 18, 2016 at 4:22 AM

Mainly the goal of SCSS is, that providing meridian and horizon themes gets easier, as we can just import the definitions from the original web application.

Jesse White July 11, 2016 at 10:48 AM

Since vaadin introduced the valo theme it is recommended to use SCSS style definitions instead of CSS and work with mixins in order to create valid style definitions.
We should migrate the existing styles to SCSS.

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PagerDuty

Created July 14, 2015 at 3:14 AM
Updated November 29, 2018 at 7:08 PM
Resolved November 27, 2018 at 9:59 AM