P: Add additional precision in Rotation

Okay, so I'd like to suggest a few things:

To make the rotation tool(and about every other slider) more precise on the phone, as it tends to "jump" when I release the touchscreen, which makes the edition process a hassle. 

Including a central cross for cropping, to make it visually easier to balance the picture. And also include other grids, as the actual is too limiting on a creative point of view.

I'd like to also report a small bug where when I export a photo, it sometimes saves older versions of it, not the last edit.

Thanks for your time, and consider those improvements for the community!