Ongoing code maintenance

[azriel91]

Closes #238.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@223f767). Click here to learn what that means.
The diff coverage is 61.08%.

@@            Coverage Diff            @@
##             master     #239   +/-   ##
=========================================
  Coverage          ?   68.84%           
=========================================
  Files             ?      650           
  Lines             ?    22358           
  Branches          ?        0           
=========================================
  Hits              ?    15392           
  Misses            ?     6966           
  Partials          ?        0           

Impacted Files	Coverage Δ
app/session_server/src/model/session_code_to_id.rs	0.00% <ø> (ø)
...ession_server/src/model/session_device_mappings.rs	0.00% <ø> (ø)
..._server/src/model/session_id_to_device_mappings.rs	0.00% <0.00%> (ø)
app/session_server/src/play/session_tracker.rs	0.00% <ø> (ø)
...erver/src/system/network_input_responder_system.rs	0.00% <0.00%> (ø)
app/session_server/src/system/session_cleaner.rs	0.00% <ø> (ø)
...stem/session_device_disconnect_responder_system.rs	0.00% <ø> (ø)
...server/src/system/session_host_responder_system.rs	0.00% <0.00%> (ø)
...server/src/system/session_join_responder_system.rs	0.00% <0.00%> (ø)
...erver/src/system/session_lobby_responder_system.rs	0.00% <ø> (ø)
... and 138 more

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