Remove QuartzImageIO

[ViralBShah]

As discussed in JuliaIO/QuartzImageIO.jl#77

[ViralBShah]

Failures on nightly are not related to this PR. I think we should be able to merge.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.66%. Comparing base (b7259eb) to head (5df2454).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #384   +/-   ##
=======================================
  Coverage   91.66%   91.66%           
=======================================
  Files          10       10           
  Lines         708      708           
=======================================
  Hits          649      649           
  Misses         59       59           

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[kimikage]

The registry table on documentation is not updated. https://juliaio.github.io/FileIO.jl/dev/registry/#Registry-table
Maybe it would be better to generate the table automatically or add something like doctest.

Also, "on all platforms with" is no longer useful at all. We do not have a "practical" mechanism to actively select libraries according to platform and that should be the reason for removing QuartzImageIO.