Branch bugs modules

[ethan-l-m-e]

Module tab now refreshes on switching to it.

Modules can be deleted when related tasks are complete.
Tasks that are complete and no longer editable can keep deleted modules.

Testcases.

Modules del error message to follow countdowns

[hanweic53]

Looks good to merge.

[codecov-io]

Codecov Report

Merging #224 (d7850c7) into master (7b4d2c6) will increase coverage by 0.82%.
The diff coverage is 60.86%.

@@             Coverage Diff              @@
##             master     #224      +/-   ##
============================================
+ Coverage     67.94%   68.76%   +0.82%     
- Complexity      924      946      +22     
============================================
  Files           126      126              
  Lines          3048     3064      +16     
  Branches        402      407       +5     
============================================
+ Hits           2071     2107      +36     
+ Misses          842      825      -17     
+ Partials        135      132       -3     

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/seedu/tr4cker/logic/LogicManager.java	66.66% <0.00%> (+10.78%)	12.00 <0.00> (+5.00)
...seedu/tr4cker/storage/JsonSerializableTr4cker.java	84.61% <0.00%> (ø)	11.00 <0.00> (ø)
src/main/java/seedu/tr4cker/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../main/java/seedu/tr4cker/ui/module/ModuleCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/tr4cker/model/Tr4cker.java	91.35% <75.00%> (+8.02%)	33.00 <0.00> (+4.00)
...va/seedu/tr4cker/logic/commands/ModuleCommand.java	94.59% <100.00%> (+0.15%)	16.00 <0.00> (ø)
...eedu/tr4cker/logic/parser/ModuleCommandParser.java	95.45% <100.00%> (ø)	11.00 <0.00> (ø)
...in/java/seedu/tr4cker/logic/parser/ParserUtil.java	92.00% <100.00%> (+0.51%)	39.00 <4.00> (+4.00)
src/main/java/seedu/tr4cker/model/Model.java	55.55% <100.00%> (+5.55%)	5.00 <0.00> (ø)
...rc/main/java/seedu/tr4cker/model/ModelManager.java	95.53% <100.00%> (+10.57%)	56.00 <1.00> (+6.00)
... and 5 more

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