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Update the bundled version of Roslyn.
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The latest version of Roslyn is 4.5.0 while the bundled version is 2.9.0 from 2018. Updating it will allow ingame scripts to use newer features of C# like the '?' null coalescing operator or the '??' null conditional operator.
It requires NET Standard 2.0 which is supported by NET Framework 4.6.2 minimum.
Porting shouldn't be too difficult.
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