Implement Auto-Archive feature and Sort Command

[joshenx]

New Features

Expired Appointments

• Expired appointment : Expired Appointments are appointments that are at least 24 hours past their scheduled DateTime.

Features

• Added UI indicator for appointments that are scheduled today
• Implement Comparable interface for Patient and Appointment classes
• Added auto-archiving feature which archives EXPIRED appointments twice:
  1. On app launch
  2. Every day at a specified UPDATE_HOUR in the ModelManager class.
• Generic sort command that sorts in the following priority:
  1. Appointment is today
  2. DateTime of appointment
  3. Name of Patient

To do

• Requires changes to UserGuide
• @didymental to implement parameter-based sorting

Bug Fixes

• Fixed incorrect command prefix from appt to apmt.

Linked Issues

Closes #110 and closes #134

UI Example

[codecov-commenter]

Codecov Report

Merging #155 (3ed59c6) into master (2f541f0) will decrease coverage by 0.59%.
The diff coverage is 56.25%.

❗ Current head 3ed59c6 differs from pull request most recent head 07e08db. Consider uploading reports for the commit 07e08db to get more accurate results

@@             Coverage Diff              @@
##             master     #155      +/-   ##
============================================
- Coverage     53.33%   52.73%   -0.60%     
  Complexity      551      551              
============================================
  Files           116      117       +1     
  Lines          2325     2359      +34     
  Branches        268      269       +1     
============================================
+ Hits           1240     1244       +4     
- Misses          998     1028      +30     
  Partials         87       87              

Impacted Files	Coverage Δ
src/main/java/seedu/docit/AppParameters.java	75.00% <ø> (ø)
src/main/java/seedu/docit/Main.java	0.00% <ø> (ø)
src/main/java/seedu/docit/MainApp.java	0.00% <0.00%> (ø)
src/main/java/seedu/docit/commons/core/Config.java	68.18% <ø> (ø)
...ain/java/seedu/docit/commons/core/GuiSettings.java	69.23% <ø> (ø)
...main/java/seedu/docit/commons/core/LogsCenter.java	78.37% <ø> (ø)
...c/main/java/seedu/docit/commons/core/Messages.java	0.00% <ø> (ø)
...rc/main/java/seedu/docit/commons/core/Version.java	82.50% <ø> (ø)
...ain/java/seedu/docit/commons/core/index/Index.java	100.00% <ø> (ø)
...it/commons/exceptions/DataConversionException.java	100.00% <ø> (ø)
... and 107 more

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[rish-16]

LGTM 👍🏻