pretty print Progress

[xgdgsc]

I find the defaultglyphs printed inline in VSCode too long and weird.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 95.07%. Comparing base (807496a) to head (46bf0fa).
Report is 22 commits behind head on master.

Files with missing lines	Patch %	Lines
src/ProgressMeter.jl	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #337      +/-   ##
==========================================
+ Coverage   93.48%   95.07%   +1.59%     
==========================================
  Files           1        1              
  Lines         399      569     +170     
==========================================
+ Hits          373      541     +168     
- Misses         26       28       +2     

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[MarcMush]

from https://docs.julialang.org/en/v1/manual/types/#man-custom-pretty-printing:

As a rule of thumb, the single-line show method should print a valid Julia expression for creating the shown object.

so we should print every non-default parameter I guess, nearly all of them can be changed

it should also include ProgressUnknown and ProgressThresh

otherwise, I believe you can just add a semi colon at the end of the line to hide the output

[xgdgsc]

I don' t think a daily utility 99% users would only change or care about the n should follow that rule or see anything inside ProgressCore . I' ve never used ProgressUnknown or ProgressThresh so I wouldn' t change that.