Added new Open Both Folders button

[inger147]

• Added new button next to duplicate image results (next to the Delete Both Images button), with tooltip text "Open both containing folders". Clicking this will open a separate windows explorer window for both of the displayed images;
• Added new PNG image of two open folders;
• Modified logic in Images.Get to enable other types of images to be loaded in addition to the default .IMG format.

Notes:

• I don't speak Russian so the Russian tooltip text I added is from a Google translation.
• I used a PNG image for the new button, because my graphics editing software (XnView) was exporting a .IMG file in a format that AntiDupl couldn't read properly (I got an OutOfMemoryException when I tried).

[ermig1979]

The folder which contains the image can be open from context menu of the image. Are you sure that opening of two folders is so often used operation that we need to create new button?

[inger147]

In my experience at least, I found that I was opening both folders so often that I found it to be quite useful to have a button available that would open both at once. For large image collections, it saves time + clicks versus using the context menu on each image, plus it lessens the chance of clicking something unintended in the context menu, such as "add to ignored folders" which I found myself clicking accidentally on occasion.

[ermig1979]

Ok. I will merge your pull request.