Implement help command

[JoeyChenSmart]

Closes #76

Automatically generate help using the already existing information in the Command's parameters.

Changes to commands

Added a new (implicitly) required constant String for each command, SHORT_DESCRIPTION which will be used in generating help.

We will follow the same convention as commits for these descriptions.

Will use this value when adding new commands to the PrimitiveCommandParser (where you have to add it is obvious when viewing the code).

Future todos?

Will have to add docs to the DG for how this works.

The UI help button still works and shows the old help popup. May have to remove this but we can do this in a separate issue.

[codecov-io]

Codecov Report

Merging #76 into master will increase coverage by 0.63%.
The diff coverage is 95.83%.

@@             Coverage Diff              @@
##             master      #76      +/-   ##
============================================
+ Coverage     72.58%   73.21%   +0.63%     
- Complexity      415      425      +10     
============================================
  Files            73       73              
  Lines          1375     1400      +25     
  Branches        107      110       +3     
============================================
+ Hits            998     1025      +27     
+ Misses          337      335       -2     
  Partials         40       40              

Impacted Files	Coverage Δ	Complexity Δ
.../java/jimmy/mcgymmy/logic/commands/AddCommand.java	100.00% <ø> (+13.04%)	4.00 <0.00> (+1.00)
...ava/jimmy/mcgymmy/logic/commands/ClearCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...va/jimmy/mcgymmy/logic/commands/DeleteCommand.java	100.00% <ø> (ø)	4.00 <0.00> (ø)
...java/jimmy/mcgymmy/logic/commands/EditCommand.java	93.33% <ø> (ø)	5.00 <0.00> (ø)
...java/jimmy/mcgymmy/logic/commands/ExitCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...java/jimmy/mcgymmy/logic/commands/FindCommand.java	100.00% <ø> (ø)	4.00 <0.00> (ø)
...java/jimmy/mcgymmy/logic/commands/ListCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
.../java/jimmy/mcgymmy/logic/commands/TagCommand.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
...ava/jimmy/mcgymmy/logic/commands/UnTagCommand.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
...mcgymmy/logic/parser/PrimitiveCommandHelpUtil.java	92.00% <92.00%> (ø)	13.00 <13.00> (?)
... and 4 more

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[dcchan98]

LGTM

[Jh123x]

LGTM!
Works on My Windows Machine too

[JoeyChenSmart]

Will make this a not draft after I add some tests or something maybe

The code is mostly formatting text to be printed so I dont think unit tests will benefit it much

[Jh123x]

Will make this a not draft after I add some tests or something maybe

The code is mostly formatting text to be printed so I don't think unit tests will benefit it much

Might need to change the logger message in ui/HelpWindow.java and remove the function that shows the help screen

[aidoxe-123]

I think it only needs some minor changes. Other than that, everything LGTM

[Jh123x]

LGTM