Paste external clipboard images

[justburner]

This is a Tahoma2D port with the following changes:

• Pasting on a Raster level cell or the empty X cell in front will automatically paste in the center instead of nagging the user by always asking if want to Paste in place or Create new level on each paste.
• Attempting to paste on non Raster level cell or empty column/location will ask the user if wants to create a new level instead of creating a new level automatically without user's consent, this is to avoid polluting the project with extra files as undo does not delete them.

More information about the T2D implementation:

• External images do require Raster level.
• Selection Tool must be active to be able to control and transform the pasted image, otherwise the image will be instantly pasted in the center.
• If the image is bigger than the level canvas then the paste will be scaled down to fit the canvas.

Resolves #3503

[RodneyBaker]

Happy new year to all!
Posting intent to merge this PR later today.

[RodneyBaker]

Thank you @justburner for the port of copy/paste from Tahoma2D and for additonal adjustments.
Thank you @jeremybullock for the original implementation!

Added Developmental Trivia: This PR is the 2000th closed Pull Request

[F-Burning]

Thank you so much!

A suggestion is don't crop or resize the image, because if you have to re-scale the raster after the resize, lose a lot quality, and when a picutre is large in horizontal at least, it's cropped and lost information too.

Happy new year! 🎊 🎉