Support configured camera orientation

[netlands]

Support configured camera orientation

[fieldOfView]

This is going to require a change in Cura for actually transforming the webcam image at the time it is being displayed, unless we accept a rather hefty performance hit transforming each frame as it comes in.

Also relies on #12 for getting the configuration from octoprint.

[fieldOfView]

Fixed in master, which will be released with Cura 2.7

[fieldOfView]

In Cura 2.7, the plugin gets the url and the orientation for the camera stream from the octoprint preferences.

[fieldOfView]

A beta of Cura 2.7 is now available. I would appreciate if you could test this functionality

[netlands]

Tested on beta of Cura 2.7.0. The camera orientation is now correctly displayed as set in OctoPrint.

New issue: because the camera view panel/layer is displayed at maximum (?) size and does not resize when resizing the Cura dialog in Cura 2.7.0 beta, the camera panel obscures part of the Cura UI (including the menu bar) when the dialog is smaller than the camera view. This might be due to the change in overall layout of the Cura interface.

[fieldOfView]

I'll see if I can fix before the final 2.7 ships

[fieldOfView]

Fixing this relies on this PR being merged: Ultimaker/Cura#2200

[fieldOfView]

Resizing issue will be fixed with #53, which relies on Ultimaker/Cura#2200

[netlands]

Verified on release version of Cura 2.7. The camera image now resizes when resizing the dialog.
Note that depending on the orientation (and aspect ratio?) of the image and the size of the dialog the resized image still overlaps with UI (for example a 90 degrees rotated image with a 16:9 aspect ratio).

[fieldOfView]

Fixed in 536b5a7