Fixed image rotation, fixed 2 typos

[f4nu]

Since my fix on PR #242 mirrored images for others and it's been reverted in #268, my images are now being wrongly flipped again.

I searched trough PIL.Image documentation and I found that rotate() rotates CCW, as OctoPrint states in the options:

The documentation states that rotate() and transpose() operations are interoperable:

transpose(ROTATE) operations can also be performed identically with :py:meth:~PIL.Image.Image.rotate operations

so the rotation needed to match OctoPrint's behaviour is Image.ROTATE_90, not Image.ROTATE_270.

This explains the correct behaviour I got with my old PR #242 with the rotation + vertical and horizontal flipping.

With Image.ROTATE_90 I'm now getting the same image while rotating and flipping in any combination

[giloser]

Hi is this still needed?
if yes could we think of something like an option in the plugin to force it to 270 instead of 90 when it's selected.
So we avoid that for some it work and for other it doesn't.

[f4nu]

I'm currently on 1.6.3 and my webcam is still flipped. I also thought of the option but I couldn't figure out how to pass the arguments from the options to that part of the script :(
Is it working as intended to you though? Is the image you get from the stream flipped/rotated the same way on Telegram?

[giloser]

I don't have the problem but I flipped my images from the script so I don't use the option to flip it.

I'll add an option to flip on 90 or 270 and I hope this will fix the problem for every one.
Will be on the next release.