Rename `flip_vertically` and `flip_horizontally` methods

[lars-reimann]

Is your feature request related to a problem?

Image and ImageList have the methods flip_vertically and flip_horizontally. The names can be slightly confusing, though, as flip_vertically flips images along a horizontal axis and flip_horizontally flips them along a vertical axis.

Desired solution

Rename

• flip_vertically to flip_top_and_bottom
• flip_horizontally to flip_left_and_right.

This makes it completely clear how the image is transformed.

Possible alternatives (optional)

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[lars-reimann]

🎉 This issue has been resolved in version 0.29.0 🎉

The release is available on:

• v0.29.0
• GitHub release

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