Printing of 'null' as output for null returning inputs.

[kindermannhubert]

Removal of null interception in PrettyPrinter. See #88.
Now we analyze input and decide if the input is void-returning or no-output (->we output nothing) or if it is value-returning (-> we print even null result).

[codecov-commenter]

Codecov Report

Merging #187 (62c91d6) into main (8855650) will increase coverage by 0.0%.
The diff coverage is 92.1%.

@@          Coverage Diff          @@
##            main    #187   +/-   ##
=====================================
  Coverage   82.1%   82.1%           
=====================================
  Files         50      50           
  Lines       3707    3734   +27     
  Branches     467     471    +4     
=====================================
+ Hits        3044    3069   +25     
- Misses       477     478    +1     
- Partials     186     187    +1     

Impacted Files	Coverage Δ
...harpRepl.Services/Roslyn/Scripting/ScriptRunner.cs	91.8% <88.4%> (-1.6%)	⬇️
CSharpRepl.Services/Roslyn/PrettyPrinter.cs	100.0% <100.0%> (ø)
CSharpRepl.Services/Roslyn/RoslynServices.cs	84.6% <100.0%> (ø)
...Repl.Services/Roslyn/Scripting/EvaluationResult.cs	66.6% <100.0%> (ø)
CSharpRepl/CSharpReplPromptCallbacks.cs	78.6% <100.0%> (ø)
CSharpRepl/ReadEvalPrintLoop.cs	91.0% <100.0%> (+1.2%)	⬆️

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