#455 fix

[TikhomirovSergey]

Change list

• the new enum MobileSelector was added.
• the refactoring of the MobileBy.
• the new interface FindsByFluentSelector was added.
• the refactoring of the IOSDriver and IOSElement.
• the refactoring of the AndroidDriver and AndroidElement.
• API was changed.
• with @Rafael-Chavez 's authorship
  • the new interface FindsByIosNSPredicate was added
  • the new searching strategy ByIosNsPredicate was added
• with @JonStoneman 's authorship
  • the new interface FindsByWindowsAutomation was added
  • the new searching strategy ByWindowsAutomation was added

Types of changes

What types of changes are you proposing/introducing to Java client?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

[TikhomirovSergey]

@SrinivasanTarget@Rafael-Chavez@JonStoneman
Could you review this PR?

[stoneman]

The windows bits look good to me. As with the .net client, we'll have to wait and see if the server will actually support -windows uiautomation.

[SrinivasanTarget]

@TikhomirovSergey LGTM 👍 Awesome new additions:)