support unicode string display

[leslie-wang]

Signed-off-by: Leslie Qi Wang leslie.qiwa@gmail.com

• [Y] I've read Contribution guide
• [T] I've tested everything that doesn't relate to tcell.Screen API

Close #76

[codecov-io]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.21%. Comparing base (af23dd1) to head (5e545a7).
⚠️ Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
interactive/reporter.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #77      +/-   ##
===========================================
- Coverage   100.00%   99.21%   -0.79%     
===========================================
  Files            7        7              
  Lines          248      255       +7     
===========================================
+ Hits           248      253       +5     
- Misses           0        1       +1     
- Partials         0        1       +1     

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[viktomas]

@leslie-wang thanks for another contribution! It's great to see the handling of edge case like this. Please make sure you add tests for all code that you add.

Could you please check whether it would be possible to use the native range loop or the native utf8 library to avoid adding unnecessary dependencies?