UI: settings show/hide update display (#1072)

* 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

src/main/java/stirling/software/SPDF/config/AppUpdateService.java

@@ -0,0 +1,25 @@
+package stirling.software.SPDF.config;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Scope;
+import org.springframework.stereotype.Service;
+
+import stirling.software.SPDF.model.ApplicationProperties;
+
+@Service
+class AppUpdateService {
+
+    @Autowired private ApplicationProperties applicationProperties;
+
+    @Autowired(required = false)
+    ShowAdminInterface showAdmin;
+
+    @Bean(name = "shouldShow")
+    @Scope("request")
+    public boolean shouldShow() {
+        boolean showUpdate = applicationProperties.getSystem().getShowUpdate();
+        boolean showAdminResult = (showAdmin != null) ? showAdmin.getShowUpdateOnlyAdmins() : true;
+        return showUpdate && showAdminResult;
+    }
+}