[x] Fix up our existing DI container registrations
[x] Update all of our IAppServices wrapper to use the new slim 3 replacement APIs
[x] Remove our MgChunkWriter and subclasses and instead re-work such usages as wrappers over the PHP standard StreamInterface, that we can then just pass to the slim3 response.
[x] Need to rework our usage of halt (probably just throw a relevant exception instead)
$this->app, to be behind a newIAppServicesinterface with an implementation that wraps the existing\Slim\Slimapp:SetResponseHeader(to wrap$this->app->response->header())WriteResponseContent(to wrap$this->app->response->write())SetResponseBody(to wrap$this->app->response->setBody())GetRequestHeader(to wrap$this->app->request->headers->get())GetRequestBody(to wrap$this->app->request->getBody())GetLocalizedText(to wrap$this->app->localizer->getText())GetRequestParametermethodGetConfig(to wrap$this->app->config())SetResponseStatus(to wrap$this->app->response->setStatus())Halt(to wrap$this->app->halt())GetRequestPathInfo(to wrap$this->app->request->getPathInfo())GetAllRequestParams(to wrap$this->app->request->params())LogDebug(to wrap$this->app->log->debug())SetResponseExpiry(to wrap$this->app->expires())SetResponseLastModified(to wrap$this->app->lastModified())GetMapGuideVersion(to wrap$this->app->MG_VERSION)HasDependecy(to wrap$this->app->container->has())GetDependency(to wrap$this->app->container->$key)$appin all our route handler closures by using\Slim\Slim::getInstance()to access this slim appIAppServiceswrapper to use the new slim 3 replacement APIsMgChunkWriterand subclasses and instead re-work such usages as wrappers over the PHP standardStreamInterface, that we can then just pass to the slim3 response.halt(probably just throw a relevant exception instead)[ ] UpdatePostponed to after 1.0-RC6swagger-phpand update the annotations (https://zircote.github.io/swagger-php/guide/migrating-to-v3.html)