Tidy up log calls in event

This reduces the category of some noisy log events, adds a category to
those missing one, and removes a number of commented-out calls.

Hopefully this will make it easier to develop on a page which has drag and drop enabled.

I considered decreasing the other Y.log calls from info to debug, but from a cursory glance they look like things you'd want to know about whereas the "Calling facade._touch" event appears on any page with dd enabled when you move your mouse.