Implement MultiSwipeActionView for multiple actions

[newhinton]

This updates this library to a newer gradle version, aswell as java and kotlin.
This implements a specific container, that allows for two children to be treated as two distinct actions.
Technically it allows for arbitrary amounts of elements, but only the first child (for the left actions) and the last child (for the right actions) are used as a divider.

What works:

• Callback for halfway-action (left&right)

What doesn't work:

• "Sticky" halfway-point. (The main view always returns to the initial state)
• Maven publishing. The gradle-syntax changed, and i dont know how to test this

[Tunous]

Thank you for the pull requests. I've reviewed your code and left few code changes requests.

[Tunous]

Thank you, looks good now. I've only pushed a small fix where swipe position was incorrect.
Will try to figure out the new publishing workflow and hopefully release a new version with your changes.

[Tunous]

Closes #19