Move System::jsonExit to BaseModule->jsonExit

- This will ensure headers set in BaseModule->run will be carried in jsonExit scenarios
- Deprecate jsonExit() method in Core\System

src/Module/Circle.php

@@ -132,7 +132,7 @@ class Circle extends BaseModule
 			}
 
 			DI::sysmsg()->addInfo($message);
-			System::jsonExit(['status' => 'OK', 'message' => $message]);
+			$this->jsonExit(['status' => 'OK', 'message' => $message]);
 		} catch (\Exception $e) {
 			DI::sysmsg()->addNotice($e->getMessage());
 			System::jsonError($e->getCode(), ['status' => 'error', 'message' => $e->getMessage()]);