More functions for images

[ondrap]

• an option to 'not overwrite 0 bytes' when drawing an image would be great; that would allow composing images
• the imgStream (and possibly imgDisplay for 1bpp images) could follow the color settings
• specify a rotation of an image; it seems that this could be done with integer math without division: https://www.geometrictools.com/Documentation/IntegerBasedRotation.pdf

Use case: I'm trying to create a kind of navigation compass and it seems currently the only way is to stream the 1bpp image to the device. Composing it from several different images directly in the device could work much better.