Various logging fixes (#164)

Various logging fixes:
* imported the ObjCWrapper and updated the MXLogger. Also added back support for app containers
* updated MXLog.swift from El and fixed/improved its logging format
* updated most app log strings
* Remove unnecessary swiftlint rule
* Various tweaks following code review
* Added back type annoation on MXLogger logFiles method
* Fix generated Swift-ObjC header name

Tools/Scripts/Templates/SimpleScreenExample/ElementX/TemplateCoordinator.swift

@@ -59,10 +59,10 @@ final class TemplateCoordinator: Coordinator, Presentable {
     // MARK: - Public
     
     func start() {
-        MXLog.debug("[TemplateCoordinator] did start.")
+        MXLog.debug("Did start.")
         templateViewModel.callback = { [weak self] action in
             guard let self = self else { return }
-            MXLog.debug("[TemplateCoordinator] TemplateViewModel did complete with result: \(action).")
+            MXLog.debug("TemplateViewModel did complete with result: \(action).")
             switch action {
             case .accept:
                 self.callback?(.accept)