Add things from PolyCore - #7

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Windows10CE wants to merge 14 commits into

MonoMod:masterfrom

Windows10CE:missing-from-polycore

Commits on Jan 13, 2026

{,ReadOnly}SpanAction<T, in TArg>
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6d4e71b
char.IsBetween and char.IsAsciiX
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5943dc5
CollectionsMarshal
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7dcbf41
Remove GetValueRef methods
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fbb7902

Commits on Jan 14, 2026

CollectionsExtensions.{AddRange,InsertRange,CopyTo,AsReadOnly}
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032569f
ISpanFormattable
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24e3d41
Enumerable.Reverse(TSource[])
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a7b4e54
RuntimeHelpers.{IsReferenceOrContainsReferences,GetUninitializedObject,TryEnsureSufficientExecutionStack}
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8e1ceb9
Marshal.InitHandle
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7252c9d
Index, Range, RuntimeHelpers.GetSubArray
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2252c45
Fix Marshal.InitHandle
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c4aa7c6
Fix warnings and errors
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d2d3823
MemoryMarshal.{GetArrayDataReference,CreateReadOnlySpanFromNullTerminated,AsRef}
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aa8628f
string.{Create,CopyTo,TryCopyTo,ReplaceLineEndings,Concat}
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54a39be