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* Fix to #3465. Prevent the, resaving of duplicate images if overwrite not specified

This is a fix to #3465 

Adds function compare_image_hash to do a sha256 hash comparison between an uploaded image and existing images with matching file names. 

This changes the behavior so that only images having the same filename that are actually different are saved to input, existing images are instead now opened instead of resaved with increment. 

Currently, exact duplicates with the same filename are resave saved with an incremented filename in the format:

<filename> (n).ext 

with the code: 

```
while os.path.exists(filepath): 
                        filename = f"{split[0]} ({i}){split[1]}"
                        filepath = os.path.join(full_output_folder, filename)
                        i += 1
```

This commit changes this to: 

```
while os.path.exists(filepath): 
                        if compare_image_hash(filepath, image):
                            image_is_duplicate = True
                            break
                        filename = f"{split[0]} ({i}){split[1]}"
                        filepath = os.path.join(full_output_folder, filename)
                        i += 1
```

a check for if image_is_duplicate = False is done before saving the file. 

Currently, if you load the same image of a cat named cat.jpg into the LoadImage node 3 times, you will get 3 new files in your input folder with incremented file names.

With this change, you will now only have the single copy of cat.jpg, that will be re-opened instead of re-saved. 

However if you load 3 different images of cats named cat.jpg, you will get the expected behavior of having:
cat.jpg
cat (1).jpg
cat (2).jpg

This saves space and clutter. After checking my own input folder, I have 800+ images that are duplicates that were resaved with incremented file names amounting to more than 5GB of duplicated data.

* fixed typo in expression

* Add --no-custom-node cmd flag

* nit

(for eta and s_noise)

This change includes corrections for several spelling errors in the
documentation of example_node.py.example file.

These were previously raised by #3157, but they missed a few.

* Bumping GitHub Actions versions

* Using LZMA2 for 7zip compression in Windows packaging

* Create CONTRIBUTING.md

* Add feature-request channel link.

* Remove discord links for channels.

The old _pp ones will be updated automatically to the regular ones with 2x
the cfg.

My fault for not checking what the "_pp" samplers actually did.

This reverts commit 449bf529.

This reverts commit 97b409cd.

* Fix auto queue

* Detect added nodes via search

* Fix loading workflows

* Add button click style

Still missing the node to properly use it.

* Add linux integration test.

* Fix directory path.

* Add paths ignore.

* Fix conda env directory path.

* Add audio widget

* Fix audio bugs

* Add CSS

* Populate audio widget when load history

Order 4 seems to give bad results.

* Update ref

* Disable some tests