Progressbar

[timsneath]

Adds progress bar control and tidies up examples accordingly

[codecov[bot]]

Codecov Report

Merging #49 (f293448) into main (e606b4e) will decrease coverage by 2.36%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
- Coverage   50.14%   47.77%   -2.37%     
==========================================
  Files          12       11       -1     
  Lines         698      720      +22     
==========================================
- Hits          350      344       -6     
- Misses        348      376      +28     

Impacted Files	Coverage Δ
lib/src/progressbar.dart	0.00% <0.00%> (ø)
lib/src/key.dart	0.00% <0.00%> (-12.50%)	:arrow_down:
lib/src/table.dart	96.95% <0.00%> (-0.04%)	:arrow_down:
lib/src/consolecolor.dart
lib/src/textalignment.dart

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