Add option to defang the protocol of urls

[baderj]

Adds an option -p to the the defang unit to escape the protocol of urls. So http becomes hxxp and ftps becomes fxps.

This is another very common way of defaning urls.

This commit also ads the reverse for fxps and fxp

[huettenhain]

This latest MacOS sure slows down testing quite a bit.

[codecov-commenter]

Codecov Report

Merging #10 (7c891e5) into master (6bc00d9) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   83.77%   83.77%   -0.01%     
==========================================
  Files         258      258              
  Lines       15750    15754       +4     
==========================================
+ Hits        13195    13198       +3     
- Misses       2555     2556       +1     

Impacted Files	Coverage Δ
refinery/units/pattern/defang.py	94.91% <100.00%> (+0.36%)	:arrow_up:
refinery/units/meta/swap.py	85.71% <0.00%> (-2.17%)	:arrow_down:
refinery/units/formats/pe/pemeta.py	86.03% <0.00%> (-0.31%)	:arrow_down:
refinery/units/pattern/xtp.py	65.51% <0.00%> (ø)
refinery/units/formats/hexload.py	94.82% <0.00%> (ø)
refinery/units/misc/drp.py	91.12% <0.00%> (+0.07%)	:arrow_up:
refinery/units/pattern/struct.py	82.14% <0.00%> (+0.66%)	:arrow_up:

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[huettenhain]

How satisfying to merge a PR where all the CI automation worked splendidly. Thank you @baderj!