Convert from byte[] RGB32 to int[] RGB32 when making ColorProcessors.

This avoids an error in PixelCalibrator when using RGB32 images, and may avoid
similar errors in other places where we call makeProcessor as well. Of course
there's no guarantee that those other places will handle an RGB image
properly.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14563 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Don't prevent the user from attempting calibration with RGB images.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14564 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd
Ensure we only operate with monochrome images when calibrating.

git-svn-id: https://valelab.ucsf.edu/svn/micromanager2/trunk@14565 d0ab736e-dc22-4aeb-8dc9-08def0aa14fd