Button Refractor #3118

Currently there is lots of props which can be reduced, (for example styles, containerStyle, buttonStyle, titleStyle, iconContainerStyle, loadingStyle) in Button, by doing:

<Button>
  <Icon ...>
  My text
</Button>

For customizing TextStyle

<Button>
  <Icon ...>
  <Text style={{ ... }}>My text</Text>
</Button>

For iconPosition we can use orientation='vertical' | 'horizontal' OR display='column' | 'row' OR Boolean column.

I think this will make component more customisable as users can add their own child as well, and make it easy to use, also in HTML/React the button is like <button>My Text</button> or in RN-Paper & NativeBase, it would be easy for user to understand & implement different libraries.

As we can't Break lib with this change, So it could be named MaterialButton OR Button2.