AppMachine Designer fixes:
- The 'Create new APK' flow has been moved into the regular Publish flow. This means that Google publishing can be started via the 'Publish Now' / 'Update Now' button again.
- Added a 'Create keystore' button on the Publish page via which users can download the keystore file of their Android app.
- Added additional security, optimisation, and stability improvements to the Publishing process.