Add muscle class (parsing, read/write, tests) (3/3)

[leeweiminsg]

• Added musclesWorked variable in Exercise class

• Made calories optional (as stated in user guide). Removed calories in equality checking (enforce functional dependency: name->calories)

• Fixed several formatting errors in previous commits

• Added parsing support (add, update)

• Modified test cases to support musclesWorked, added previously commented-out ones

• Added UI support

• Some issues with storage and UI: will add to issues

[codecov-io]

Codecov Report

Merging #72 into v1.3 will decrease coverage by 1.32%.
The diff coverage is 39.11%.

@@             Coverage Diff              @@
##               v1.3      #72      +/-   ##
============================================
- Coverage     60.68%   59.36%   -1.33%     
- Complexity      518      571      +53     
============================================
  Files           100      111      +11     
  Lines          1928     2254     +326     
  Branches        197      249      +52     
============================================
+ Hits           1170     1338     +168     
- Misses          672      825     +153     
- Partials         86       91       +5     

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/seedu/address/TestDriver.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...a/seedu/address/logic/LogicManagerForExercise.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../java/seedu/address/logic/commands/AddCommand.java	83.33% <ø> (ø)	7.00 <0.00> (ø)
...ddress/logic/commands/AddExerciseFromTemplate.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...edu/address/logic/commands/AddTemplateCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...edu/address/logic/commands/CommandForExercise.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...va/seedu/address/logic/commands/CommandResult.java	88.23% <ø> (ø)	10.00 <0.00> (ø)
...va/seedu/address/logic/commands/RecallCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...ss/logic/parser/AddExerciseFromTemplateParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...address/logic/parser/AddTemplateCommandParser.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 49 more

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