Make AnnotationStore singleton (#3174)

* Update WebKnossosModule.scala

* changelog

* add import

CHANGELOG.md

@@ -31,6 +31,7 @@ For upgrade instructions, please check the [migration guide](MIGRATIONS.md).
 - Fixed a regression bug which caused the initial data loading to fail sometimes. [#3149](https://github.com/scalableminds/webknossos/pull/3149)
 - Fixed a bug which caused a blank screen sometimes when the user is not logged in. [#3167](https://github.com/scalableminds/webknossos/pull/3167)
 - Fixed a bug where NML downloads of Task Annotations failed. [#3166](https://github.com/scalableminds/webknossos/pull/3166)
+- Fixed a bug where vieweing Compound Annotations (such as all tasks for a project in one view) failed. [#3174](https://github.com/scalableminds/webknossos/pull/3174)
 
 ### Removed
 

app/WebKnossosModule.scala

@@ -1,5 +1,6 @@
 import com.google.inject.AbstractModule
 import controllers.InitialDataService
+import models.annotation.AnnotationStore
 import models.task.TaskService
 import models.user._
 import oxalis.user.UserCache
@@ -17,5 +18,6 @@ class WebKnossosModule extends AbstractModule {
     bind(classOf[UserExperiencesDAO]).asEagerSingleton()
     bind(classOf[UserDataSetConfigurationDAO]).asEagerSingleton()
     bind(classOf[UserCache]).asEagerSingleton()
+    bind(classOf[AnnotationStore]).asEagerSingleton()
   }
 }