Handle special chars with custom control mappings

[bit-willi]

Allow usage of special chars with custom control mappings

Closes #282

[AydinHassan]

thanks @bit-willi - can you add a test for it? You can just copy testAddCustomControlMapping and also copy the asset file testAddCustomControlMapping.txt - you would just have to change the mapping and terminal mock.

[AydinHassan]

thank you @bit-willi :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.47%. Comparing base (835c28e) to head (5a6cec9).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #283   +/-   ##
=========================================
  Coverage     93.46%   93.47%           
- Complexity      656      658    +2     
=========================================
  Files            38       38           
  Lines          2021     2024    +3     
=========================================
+ Hits           1889     1892    +3     
  Misses          132      132           

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