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In the future could support user provided excluded dirs via config file

Refactored variable names to better match what they represent

It can be useful to paste images from the clipboard directly into the node graph.
This commit modifies copy and paste handling to support this.

When an image file is found in the clipboard, we check whether an image node is selected.
If so, paste the image into that node. Otherwise, a new node is created.
If no image data are found in the clipboard, we call the original Litegraph paste.
To ensure that onCopy and onPaste events are fired, we override Litegraph's ctrl+c and ctrl+v handling.

Try to detect whether the pasted image is a real file on disk, or just pixel data copied from e.g. Photoshop.
Pasted pixel data will be called 'image.png' and have a creation time of now.
If it is simply pasted data, we store it in the subfolder /input/clipboard/.

This also adds support for the subfolder property in the IMAGEUPLOAD widget.

Don't add SRFormer because the code license is incompatible with the GPL.

Remove MAT because it's unused and the license is incompatible with GPL.

* Added label for autoQueueCheckbox.

* Menu gets behind of some custom nodes.

* Edited extraOptions.
Options divided in to different divs to manage them with ease.

Found while tinkering.