Support C# 7 via light-up

[sharwell]

No description provided.

[codecov]

Codecov Report

Merging #2370 into master will decrease coverage by 0.71%.
The diff coverage is 66.9%.

@@            Coverage Diff            @@
##           master   #2370      +/-   ##
=========================================
- Coverage   96.01%   95.3%   -0.72%     
=========================================
  Files         607     664      +57     
  Lines       85745   87833    +2088     
  Branches     3358    3428      +70     
=========================================
+ Hits        82328   83709    +1381     
- Misses       2499    3206     +707     
  Partials      918     918

Impacted Files	Coverage Δ
...StyleCop.Analyzers/Lightup/RefTypeSyntaxWrapper.cs	0% <0%> (ø)
...leCop.Analyzers/Lightup/WhenClauseSyntaxWrapper.cs	0% <0%> (ø)
....Analyzers/Lightup/TupleExpressionSyntaxWrapper.cs	0% <0%> (ø)
...Cop.Analyzers/Lightup/TupleElementSyntaxWrapper.cs	0% <0%> (ø)
...ers/Lightup/CommonForEachStatementSyntaxWrapper.cs	0% <0%> (ø)
...ers/Lightup/LocalFunctionStatementSyntaxWrapper.cs	0% <0%> (ø)
...s/Lightup/ForEachVariableStatementSyntaxWrapper.cs	0% <0%> (ø)
...op.Analyzers/Lightup/RefExpressionSyntaxWrapper.cs	0% <0%> (ø)
...zers/Lightup/DeclarationExpressionSyntaxWrapper.cs	0% <0%> (ø)
...ers/Lightup/CasePatternSwitchLabelSyntaxWrapper.cs	0% <0%> (ø)
... and 105 more

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[roterdam]

Is there a released version of this change?

[sharwell]

@roterdam This PR allows us to support C# 7, but doesn't actually update any of the rules to use it. We're still working on updating the rules themselves but I'm hoping to release the first beta that includes this work soon.

[roterdam]

thank you, eagerly waiting for this as I don't want to remove StyleCop just to use C# 7 features.