refactor: get_help in superclass, some cmd code cleanup

[chuck-sys]

Details

Developers no longer have to rewrite the get_help function when doing commands.

For users, when you want to get help for a subcommand (like you want to get a short list of subcommands that you can use), no longer do you have every single use case of the subcommand and parameters. You now get (if the subcommand supports it) a short list of subcommands, like how you would if you did /rocket help.

Affects #454 Affects #395

[codecov[bot]]

Codecov Report

Merging #598 (6de8b44) into master (2bf6df0) will decrease coverage by 0.15%. The diff coverage is 90.38%.

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
- Coverage   93.06%   92.91%   -0.16%     
==========================================
  Files          43       43              
  Lines        2524     2442      -82     
  Branches      337      328       -9     
==========================================
- Hits         2349     2269      -80     
+ Misses        117      115       -2     
  Partials       58       58              

Impacted Files	Coverage Δ
app/controller/command/commands/export.py	82.75% <ø> (+1.57%)	:arrow_up:
app/controller/command/commands/team.py	85.47% <82.14%> (-0.88%)	:arrow_down:
app/controller/command/commands/iquit.py	100.00% <100.00%> (ø)
app/controller/command/commands/karma.py	92.10% <100.00%> (-0.92%)	:arrow_down:
app/controller/command/commands/mention.py	100.00% <100.00%> (ø)
app/controller/command/commands/project.py	96.73% <100.00%> (-0.22%)	:arrow_down:
app/controller/command/commands/token.py	100.00% <100.00%> (ø)
app/controller/command/commands/user.py	98.81% <100.00%> (-0.12%)	:arrow_down:
app/controller/command/parser.py	97.18% <100.00%> (-2.82%)	:arrow_down:

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