Eliminate duplicate types already defined in ColorTypes.jl

[juliohm]

This PR fixes issue #731

It depends on:

• Export types used in other packages of the Images.jl project JuliaGraphics/ColorTypes.jl#111
• Eliminate duplicate types already defined in ColorTypes.jl JuliaGraphics/Colors.jl#320

[juliohm]

Restarting the build...

[juliohm]

Restarting build...

[juliohm]

Ready to merge 👍

[timholy]

Needs minimum bounds on ColorTypes and possibly ImageMorphology depending on why those exports are being removed.

[codecov]

Codecov Report

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The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #734   +/-   ##
=========================================
  Coverage          ?   96.01%           
=========================================
  Files             ?       10           
  Lines             ?      727           
  Branches          ?        0           
=========================================
  Hits              ?      698           
  Misses            ?       29           
  Partials          ?        0

Impacted Files	Coverage Δ
src/Images.jl	100% <ø> (ø)

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[juliohm]

Done 👍