Use SIMD code generator

[jakobnissen]

This PR is only compatible with BioJulia/Automa.jl#60 - so it can't be merged yet. I'm ambivalent as to whether this should be merged at all.

See that PR for the pros/cons

[codecov]

Codecov Report

Merging #42 (79dd2c2) into release-2 (e9202ba) will decrease coverage by 2.94%.
The diff coverage is 0.00%.

@@              Coverage Diff              @@
##           release-2      #42      +/-   ##
=============================================
- Coverage      83.57%   80.63%   -2.95%     
=============================================
  Files             11       12       +1     
  Lines            615      661      +46     
=============================================
+ Hits             514      533      +19     
- Misses           101      128      +27     

Flag	Coverage Δ
unittests	80.63% <0.00%> (-2.95%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/fasta/readrecord.jl	96.42% <ø> (ø)
src/fastq/readrecord.jl	46.15% <0.00%> (ø)
src/fasta/record.jl	65.24% <0.00%> (-15.05%)	⬇️
src/fastq/reader.jl	89.36% <0.00%> (-1.12%)	⬇️
src/fastq/record.jl	82.39% <0.00%> (-1.07%)	⬇️
src/fasta/reader.jl	89.85% <0.00%> (-0.63%)	⬇️
src/fasta/index.jl	100.00% <0.00%> (ø)
src/FASTX.jl	100.00% <0.00%> (ø)
src/fastq/writer.jl	96.77% <0.00%> (+0.22%)	⬆️
... and 2 more

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[jakobnissen]

Okay, here is what need to happen before I am comfortable merging this:

• Optimized Armv8 methods jakobnissen/ScanByte.jl#2 gets solved. I don't own a computer with an Armv8 chip, so I can't do this
• Tests need to be refactored to be sure we don't mess anything up.

[jakobnissen]

This will be made obsolete with Automa v1, which will hopefully land in a few months at most