Bump Immutable to 8.0.0

Fix rsp

Add Directory.Build.rsp

Merge pull request #72 from grokys/perf-fixes

Merge branch 'main' into perf-fixes

Fix newlines

Set LF as the end of line

Merge pull request #71 from grokys/missing-nodes-not-null

Restore whitespace

Avoid allocations in name token and whitespace trivia caches

Fix double ToArray() in SyntaxNodeRemover

Add incremental parsing benchmarks

Merge branch 'nullable-annotations' into missing-nodes-not-null

Remove file committed by accident.

Fix remaining nullable API issues