Update Asset fields and change method of editing

[yisiox]

Updated asset to include a id and location field (changed, see below)

How it works: The user inputs assets in the format A/NAME[#ID][@LOCATION]. In other words, id and location are optional, and must be delimited by # and @.

Snippet of test code for reference (only the first 4 are valid asset descriptions)

GUI display is still rudimentary

Update to Update

Location field has been removed as discussed. The validation for assets is now \s*([^#\s]+\s*)+(#(\s*[^#\s]+\s*)+)?

Update to Update to Update

Assets only have names. Prefixes are changed to use '\' instead. Person names are allowed to have special characters except the backslash.

Updated edita to asset

As discussed, edita has been renamed to asset in order to maintain a set of commands in "natural language".

Tests

Asset test has been updated to match.

[codecov]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 76.99%. Comparing base (3f03477) to head (0b101ce).

Files	Patch %	Lines
...java/seedu/address/logic/commands/CommandType.java	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #128      +/-   ##
============================================
- Coverage     77.01%   76.99%   -0.03%     
  Complexity      515      515              
============================================
  Files            75       75              
  Lines          1597     1595       -2     
  Branches        143      143              
============================================
- Hits           1230     1228       -2     
  Misses          337      337              
  Partials         30       30              

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[yisiox]

Also fixes #169

[aureliony]

The user guide also needs to be updated.

[yisiox]

The user guide also needs to be updated.

Will be fixed in a separate PR.