Add support to save command line options to the dojorc

[JamesLMilner]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code has been formatted with prettier as per the readme code style guidelines
• [x] Unit or Functional tests are included in the PR

Description:

@agubler already wrote this but it is not in line with latest master. This should solve that.

Resolves #211

[JamesLMilner]

I changed this to support showing --save in the help feedback

EDIT: @agubler let me know what you think

[codecov[bot]]

Codecov Report

Merging #255 into master will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #255      +/-   ##
==========================================
+ Coverage   98.13%   98.17%   +0.04%     
==========================================
  Files          21       21              
  Lines         965      988      +23     
  Branches      183      188       +5     
==========================================
+ Hits          947      970      +23     
  Misses         18       18              

Impacted Files	Coverage Δ
src/help.ts	100.00% <100.00%> (ø)
src/registerCommands.ts	100.00% <100.00%> (ø)

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