FEAT: Automatically switch between RGB / grayscale lineprofile
DOC: Add viewer example for RGB line profile
FIX: refactor code, fix linewidth calculation
FIX: lineprofile no longer flips on left half and cardinals work
FIX: remove blit, fix 0-length error on grayscale images
FIX: only reset axes when gray <-> rgb, not every update
FIX: No longer reset for each update
Merge pull request #615 from JDWarner/fix_lineprofile

Fix lineprofile viewer plugin