Change MainWindow to update student and schedule list after each command

[justinlengch]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 11.76471% with 15 lines in your changes are missing coverage. Please review.

Project coverage is 70.77%. Comparing base (38fa4bd) to head (139a7c1).

Files	Patch %	Lines
src/main/java/seedu/address/ui/MainWindow.java	0.00%	9 Missing ⚠️
.../main/java/seedu/address/ui/ScheduleListPanel.java	0.00%	4 Missing ⚠️
...seedu/address/logic/commands/AddLessonCommand.java	0.00%	1 Missing ⚠️
...u/address/logic/parser/AddLessonCommandParser.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #66      +/-   ##
============================================
- Coverage     71.25%   70.77%   -0.49%     
  Complexity      455      455              
============================================
  Files            79       79              
  Lines          1604     1615      +11     
  Branches        160      161       +1     
============================================
  Hits           1143     1143              
- Misses          416      427      +11     
  Partials         45       45              

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[leepoeaik]

Amazing! LGTM!