Account:: namespace simplifications and cleanup (#2110)

* Flatten Holding model

* Flatten balance model

* Entries domain renames

* Fix valuations reference

* Fix trades stream

* Fix brakeman warnings

* Fix tests

* Replace existing entryable type references in DB

test/interfaces/entryable_resource_interface_test.rb

@@ -9,13 +9,13 @@ module EntryableResourceInterfaceTest
   end
 
   test "shows editing drawer" do
-    get account_entry_url(@entry)
+    get entry_url(@entry)
     assert_response :success
   end
 
   test "destroys entry" do
-    assert_difference "Account::Entry.count", -1 do
-      delete account_entry_url(@entry)
+    assert_difference "Entry.count", -1 do
+      delete entry_url(@entry)
     end
 
     assert_enqueued_with job: SyncJob