New node: Test image

Test Image node simply provide prepared image input.

New node: SubDirectory Move node

This node move directory value to subdirectory based to specific input.

Example: All image in directory resized and save to /output directory

• Bug fix: Mask node could not connect to mask image.
• Modified some of node handle appearance
• Modified connection remove appearance
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• Debug node: remove unused option input
• Enabled image preview for all nodes by default.