[android] Delete Cupcake localStorage shim.
[android] Remove plugin code from platform.js

- Moves window.openDatabase() clobber into a symbols file
- Moves App symbols into the platform.js file
[ios] Move logger init into plugininit.js
[win] Move plugin logic out of platform.js

Moves notification, DOMStorage and XHRPatch out via plugininit.js files.