View ungraded missions and quests

[wilinetan]

Fixes #25
Fixes #137
Fixes #148

[codecov-io]

Codecov Report

Merging #146 into master will decrease coverage by 1.32%.
The diff coverage is 17.50%.

@@             Coverage Diff              @@
##             master     #146      +/-   ##
============================================
- Coverage     53.11%   51.78%   -1.33%     
- Complexity      505      509       +4     
============================================
  Files           111      113       +2     
  Lines          2169     2242      +73     
  Branches        220      234      +14     
============================================
+ Hits           1152     1161       +9     
- Misses          959     1017      +58     
- Partials         58       64       +6     

Impacted Files	Coverage Δ	Complexity Δ
...dress/logic/commands/ViewConsultationsCommand.java	54.54% <0.00%> (-15.46%)	2.00 <0.00> (-1.00)
...ess/logic/commands/ViewMissionDeadlineCommand.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...s/logic/commands/ViewPastConsultationsCommand.java	54.54% <0.00%> (-15.46%)	2.00 <0.00> (-1.00)
...gic/commands/ViewUpcomingConsultationsCommand.java	54.54% <0.00%> (-15.46%)	2.00 <0.00> (-1.00)
...ain/java/seedu/address/logic/parser/CliSyntax.java	83.33% <ø> (ø)	1.00 <0.00> (ø)
.../seedu/address/logic/parser/ViewCommandParser.java	72.41% <0.00%> (-5.37%)	7.00 <0.00> (ø)
src/main/java/seedu/address/model/AddressBook.java	54.68% <0.00%> (-1.77%)	18.00 <0.00> (ø)
...rc/main/java/seedu/address/model/ModelManager.java	68.13% <0.00%> (+1.83%)	28.00 <0.00> (+1.00)
...main/java/seedu/address/model/mission/Mission.java	69.23% <ø> (ø)	8.00 <0.00> (ø)
...main/java/seedu/address/model/quest/QuestList.java	29.41% <0.00%> (-42.02%)	3.00 <0.00> (ø)
... and 15 more

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[peironggg]

Thanks for the hard work :)