Add new commands and integrate undo/redo functionality

[seowalex]

Adds new commands for making recipes and deleting specific quantities of ingredients. Also integrated undo/redo functionality into all commands that modify the model.

Closes #45, closes #68, closes #88 and closes #92.

[codecov-io]

Codecov Report

Merging #96 into master will decrease coverage by 1.69%.
The diff coverage is 11.55%.

@@             Coverage Diff              @@
##             master      #96      +/-   ##
============================================
- Coverage     32.33%   30.64%   -1.70%     
- Complexity      517      519       +2     
============================================
  Files           170      177       +7     
  Lines          3321     3511     +190     
  Branches        335      360      +25     
============================================
+ Hits           1074     1076       +2     
- Misses         2128     2314     +186     
- Partials        119      121       +2     

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/chopchop/logic/CommandDispatcher.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...java/chopchop/logic/commands/AddRecipeCommand.java	37.50% <0.00%> (-8.66%)	3.00 <0.00> (ø)
src/main/java/chopchop/logic/commands/Command.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...a/chopchop/logic/commands/DeleteRecipeCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...chopchop/logic/commands/FindIngredientCommand.java	100.00% <ø> (ø)	6.00 <0.00> (ø)
...ava/chopchop/logic/commands/FindRecipeCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...main/java/chopchop/logic/commands/HelpCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...chopchop/logic/commands/ListIngredientCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...ava/chopchop/logic/commands/ListRecipeCommand.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...ava/chopchop/logic/commands/MakeRecipeCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 25 more

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[zhiayang]

looks good

also why tf you got something against using var?

[seowalex]

Still missing tests, but functionality should all be there.

[zhiayang]

btw doing closes A, B, C, and D only marks A as being closed by this pr

[seowalex]

TIL ok will change.