Improvements to logging (#457)

* Use `.info` logging in most places.
* Remove old objc logging support.
* Fix table view controller.
* Make sure timeline item content isn't logged.
* Add tests.

ElementX/Sources/Screens/RoomMembers/RoomMemberDetailsViewModel.swift

@@ -60,7 +60,7 @@ class RoomMemberDetailsViewModel: RoomMemberDetailsViewModelType, RoomMemberDeta
                 state.members[index].avatar = image
             }
         case .failure(let error):
-            MXLog.debug("Failed to retrieve room member avatar: \(error)")
+            MXLog.error("Failed to retrieve room member avatar: \(error)")
         }
     }
 }