Allow all tools to work on rotated layers

[JordanMagnuson]

Part of Improvements to bounding boxes and rasterized layers

Intermediate solution:

• Program setting to "automatically rasterize layer when attempting to use tools on it" (So e.g. attempting to erase on a rotated layer would automatically rasterize the layer so the erase can be performed.)

List of tools that need to be updated to work on rotated layers:

• Image > Trim (trim layer does not currently work correctly on rotated layers)
• Selection tool (currently selection is not transformed correctly when e.g. copying or deleting selection of rotated layer)
• Erase
• Magic wand
• Paint bucket / Fill
• Clone
• Crop
• Blur
• Sharpen
• Desaturate
• Bulge/Pinch

See #287 (comment)
See #287 (comment)

See also Setting to automatically trim/expand layer size after image manipulation

[JordanMagnuson]

An easier intermediate "solution" to using tools on rotated layers could be to have a program setting to "automatically rasterize layer when attempting to use tools on it." (So e.g. attempting to erase on a rotated layer would automatically rasterize the layer so the erase can be performed.)