Scratch Mobile v1.0.0 Zoom

[zanghz]

Hello, thank you very much to provide scratch source, the use of two problems found:

1. Mobile Source v1.0.0 Zoom version, the source code does not support zoom, while the corresponding Scratch.apk can be zoom.
2. Scratch.apk ，after zoom can not drag the stage on the module.
   Can you modify the above problems? Or explain the modified method, thank you.