[READY] LSP: Allow globs in GetProjectRootFiles

[bstaletic]

Some languages name the project description file after the root directory.
I.e. foo/foo.csproj and foo/foo.sln in case of C#.

This accommodates those language servers.

This is the last part needed for users to be able to use Omnisharp-Roslyn through GenericLanguageServer.
We should still get #1752 working, if for no other reason, then not to drag ancient omnisharp version.

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This change is 

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.90%. Comparing base (779a711) to head (89ececb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1759      +/-   ##
==========================================
- Coverage   95.94%   95.90%   -0.05%     
==========================================
  Files          84       84              
  Lines        8464     8465       +1     
  Branches      163      163              
==========================================
- Hits         8121     8118       -3     
- Misses        293      297       +4     
  Partials       50       50