Add connections between rooms based on movement

[ethorondil]

It used to be that moving from room A to room B creates a connection. This seems to have been changed to create connections based on the room IDs given by MUME. But sometimes MUME does not place room IDs in exits (I think if underground / in the dark). This commit also adds a connection from room A to room B if you move from A to B, and both A and B have server IDs, during mapping mode. This makes mapping underground areas possible by just moving back and forth.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 67.05%. Comparing base (c59476e) to head (06ff9cb). Report is 75 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #379      +/-   ##
==========================================
- Coverage   68.77%   67.05%   -1.73%     
==========================================
  Files          84       85       +1     
  Lines        4029     4107      +78     
  Branches      249      249              
==========================================
- Hits         2771     2754      -17     
- Misses       1258     1353      +95     

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[nschimme]

@ethorondil Please pull from master. I've made a fix that is hopefully better.