compare against vscode

[jeancroy]

Ensure that we pass score quality issues raised against vscode (in addition to atom)

See test suite here:
https://github.com/Microsoft/vscode/blob/master/src/vs/base/test/common/filters.test.ts

And implementation here:
https://github.com/Microsoft/vscode/blob/master/src/vs/base/common/filters.ts

In particular see test with actual issue number next to it ( real life scenario )
Also check character per character highlight test, which we mostly lack beside very easy test.