Attribute mega update

[Bandov]

fixed multiple same attribute parsing for all classes that need attributes, fixed error messages not syncing up, fixed birthday attribute parsing and functionality

[codecov]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 74.33%. Comparing base (94c1ac1) to head (fbb2db3).
Report is 2 commits behind head on master.

Files	Patch %	Lines
.../seedu/address/logic/parser/EditCommandParser.java	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #265      +/-   ##
============================================
+ Coverage     74.21%   74.33%   +0.11%     
- Complexity      842      853      +11     
============================================
  Files           108      108              
  Lines          2715     2735      +20     
  Branches        365      374       +9     
============================================
+ Hits           2015     2033      +18     
- Misses          601      602       +1     
- Partials         99      100       +1     

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