Implement UI for pr and fix previous UI bugs

[richardcom]

Implement UI for Problem reports
Fix #207

[codecov-io]

Codecov Report

Merging #222 into master will decrease coverage by 0.60%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master     #222      +/-   ##
============================================
- Coverage     47.17%   46.57%   -0.61%     
  Complexity      522      522              
============================================
  Files           124      126       +2     
  Lines          2476     2508      +32     
  Branches        324      329       +5     
============================================
  Hits           1168     1168              
- Misses         1223     1255      +32     
  Partials         85       85              

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/seedu/address/logic/LogicManager.java	33.33% <0.00%> (-0.76%)	3.00 <0.00> (ø)
...dress/logic/commands/FindProblemReportCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...edu/address/logic/commands/ViewProblemCommand.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)
...n/java/seedu/address/ui/ProblemReportListCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../java/seedu/address/ui/ProblemReportListPanel.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)

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