Fix gui-related bugs

[ktaekwon000]

Closes #182, #193, #196, #198, #200, #204, #229.

[codecov]

Codecov Report

Merging #230 into master will decrease coverage by 1.32%.
The diff coverage is 6.32%.

@@             Coverage Diff              @@
##             master     #230      +/-   ##
============================================
- Coverage     64.13%   62.80%   -1.33%     
  Complexity      775      775              
============================================
  Files           119      120       +1     
  Lines          2919     2984      +65     
  Branches        346      350       +4     
============================================
+ Hits           1872     1874       +2     
- Misses          930      992      +62     
- Partials        117      118       +1     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/seedu/address/commons/core/GuiSettings.java	69.23% <ø> (ø)	5.00 <0.00> (ø)
...main/java/seedu/address/commons/core/Messages.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...rc/main/java/seedu/address/ui/AppointmentCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rc/main/java/seedu/address/ui/CalendarDisplay.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/HelpWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/address/ui/PatientCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...c/main/java/seedu/address/ui/PatientListPanel.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...java/seedu/address/ui/skin/CustomEightDaySkin.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...s/logic/parser/AddProfilePictureCommandParser.java	75.00% <60.00%> (-8.34%)	3.00 <0.00> (ø)
... and 2 more

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[gsmoon97]

LGTM!