Replace Phone with Priority

[jonahtanjz]

• Replace all instances of Phone with Priority
• Priority is optional in Add command, default to LOW if not specified
• Add colours to different priorities in UI
• Update JUnit test to work with Priority

[codecov-commenter]

Codecov Report

Merging #50 into master will decrease coverage by 0.48%.
The diff coverage is 76.71%.

@@             Coverage Diff              @@
##             master      #50      +/-   ##
============================================
- Coverage     72.31%   71.82%   -0.49%     
- Complexity      400      405       +5     
============================================
  Files            70       70              
  Lines          1228     1253      +25     
  Branches        124      126       +2     
============================================
+ Hits            888      900      +12     
- Misses          308      320      +12     
- Partials         32       33       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../java/seedu/address/logic/commands/AddCommand.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
.../java/seedu/address/model/util/SampleDataUtil.java	20.00% <ø> (ø)	1.00 <0.00> (ø)
src/main/java/seedu/address/ui/PersonCard.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...main/java/seedu/address/model/person/Priority.java	82.60% <82.60%> (ø)	11.00 <11.00> (?)
...c/main/java/seedu/address/model/person/Person.java	97.56% <88.88%> (ø)	21.00 <1.00> (ø)
...java/seedu/address/logic/commands/EditCommand.java	97.01% <100.00%> (ø)	12.00 <0.00> (ø)
...a/seedu/address/logic/parser/AddCommandParser.java	100.00% <100.00%> (ø)	5.00 <0.00> (ø)
...ain/java/seedu/address/logic/parser/CliSyntax.java	83.33% <100.00%> (ø)	1.00 <0.00> (ø)
.../seedu/address/logic/parser/EditCommandParser.java	92.30% <100.00%> (ø)	11.00 <0.00> (ø)
...in/java/seedu/address/logic/parser/ParserUtil.java	97.22% <100.00%> (ø)	14.00 <2.00> (ø)
... and 2 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f1d1c27...db983c1. Read the comment docs.

[bchenghi]

The changes look great! I added some comments below.

[rolandyuwy]

Just a few small suggestions.

[bchenghi]

Thanks! LGTM

[rolandyuwy]

LGTM