Support for Mobile Gestures

[kylemellander]

I would love to see some kind of support for mobile devices for gestures. There would probably need to be different options for what kind of gestures you support, if any, and the implementation would need to not get too weighty. The gestures I'd love to see are:

1. swipe open
2. swipe closed
3. pan opened
4. pan closed
5. menu grab area threshold

[offirgolan]

@kylemellander PR #4 includes the ability to swipe open / close the menu with some threshold options. The pan gesture might be a bit difficult to do so I will prolly need a good amount of time to find a suitable lightweight solution to it. In the meantime, I'll leave this issue open 😸.

[knownasilya]

Seeing some issues in iOS, see #63 (comment)