Updated YouiEngineDriver to use CommandExecutor

[HeloiseRD]

Change list

Added YouiEngineDriver.java and supporting files and classes.
Overloaded swipe method with a call to internal TouchAction method.

Types of changes

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

Details

Subclassed Appium Driver.

Swipe is a virtual method in the AppiumDriver which we subclass so we need to implement it. Originally we would call the super implementation and pass through the parameters but You.i Engine doesn't yet support 'duration' so I added an actual implementation.