Allows cleaning up on App Pause to perform separately from memory pruning functions

app/src/main/java/com/vitorpamplona/amethyst/ServiceManager.kt

@@ -115,7 +115,11 @@ object ServiceManager {
         Client.disconnect()
     }
 
-    fun cleanUp() {
+    fun cleanObservers() {
+        LocalCache.cleanObservers()
+    }
+
+    fun trimMemory() {
         LocalCache.cleanObservers()
 
         val accounts = LocalPreferences.allLocalAccountNPubs().mapNotNull { decodePublicKeyAsHexOrNull(it) }.toSet()

app/src/main/java/com/vitorpamplona/amethyst/ui/MainActivity.kt

@@ -103,6 +103,7 @@ class MainActivity : AppCompatActivity() {
     }
 
     override fun onPause() {
+        ServiceManager.cleanObservers()
         // if (BuildConfig.DEBUG) {
         debugState(this)
         // }
@@ -127,7 +128,7 @@ class MainActivity : AppCompatActivity() {
         super.onTrimMemory(level)
         println("Trim Memory $level")
         GlobalScope.launch(Dispatchers.Default) {
-            ServiceManager.cleanUp()
+            ServiceManager.trimMemory()
         }
     }