Provide a way to override the project root the language server uses.

[hzeller]

With the new environment variable VERIBLE_LS_PROJECTROOT_OVERRIDE, it is possible to override whatever project root the editor provides.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (a4d61b1) 92.95% compared to head (2b4d526) 92.95%.

Files	Patch %	Lines
verilog/tools/ls/verilog-language-server.cc	75.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2077      +/-   ##
==========================================
- Coverage   92.95%   92.95%   -0.01%     
==========================================
  Files         358      358              
  Lines       26446    26449       +3     
==========================================
+ Hits        24583    24585       +2     
- Misses       1863     1864       +1     

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