Add edit command

[seowalex]

Fixes #87 and fixes #140. Errors are however still not being propagated correctly, see #139.

[codecov-io]

Codecov Report

Merging #137 into master will decrease coverage by 0.89%.
The diff coverage is 29.85%.

@@             Coverage Diff              @@
##             master     #137      +/-   ##
============================================
- Coverage     47.42%   46.52%   -0.90%     
- Complexity      692      703      +11     
============================================
  Files           119      119              
  Lines          2834     2893      +59     
  Branches        380      392      +12     
============================================
+ Hits           1344     1346       +2     
- Misses         1322     1374      +52     
- Partials        168      173       +5     

Impacted Files	Coverage Δ	Complexity Δ
...ava/chopchop/logic/commands/EditRecipeCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...in/java/chopchop/logic/edit/TagEditDescriptor.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...main/java/chopchop/logic/parser/CommandParser.java	84.09% <0.00%> (-1.96%)	19.00 <0.00> (ø)
...pchop/logic/parser/commands/EditCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...ain/java/chopchop/model/attributes/ExpiryDate.java	73.68% <0.00%> (ø)	6.00 <0.00> (ø)
src/main/java/chopchop/model/attributes/Step.java	60.00% <0.00%> (-10.00%)	5.00 <3.00> (+1.00)	⬇️
...model/attributes/TagContainsKeywordsPredicate.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../main/java/chopchop/model/util/SampleDataUtil.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/chopchop/ui/DisplayController.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/chopchop/ui/IngredientCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 14 more

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[zhiayang]

👍