Support for alternate image formats (ex. heic)

[LegalizeNukes]

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Problem

Certain image formats, such as .heic, don't seem to be supported in Maccy. I noticed this when changing the default image format of my screenshots using the command "defaults write com.apple.screencapture type [type]". If "heic" is entered and a screenshot taken and saved to the clipboard, it will not have a preview in Maccy (as a thumbnail and when hovered over) and will instead appear as a blank space.

Solution

Add support for previews in Maccy for alternate image types.