* UI: settings show/hide update display
This PR replaces the PR #1003
In this PR, the visual for available update is added to the foreground.
There are new settings to generally show/hide the update display, and only administrators receive the update display.
* change to `Bean`
* Update AppUpdateShowService.java
* add update message
* revision service
* change shouldShow
* Update githubVersion.js
* rm folder
* Update AppUpdateService.java
