Accept worlds by name instead of ID

[octylFractal]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 11.78%. Comparing base (6941d95) to head (5da1972).
Report is 284 commits behind head on version/7.2.x.

Files	Patch %	Lines
...89q/worldedit/command/argument/WorldConverter.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##             version/7.2.x    #1716   +/-   ##
================================================
  Coverage            11.78%   11.78%           
  Complexity            1051     1051           
================================================
  Files                  801      801           
  Lines                32675    32675           
  Branches              3848     3848           
================================================
  Hits                  3852     3852           
  Misses               28636    28636           
  Partials               187      187           

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