Pull uncontroversial changes from haxe-numeric branch

[Simn]

This should not break anything.

[Copilot]

Pull request overview

This PR pulls a set of “uncontroversial” changes from the haxe-numeric branch, primarily aligning 32-bit I/O APIs with haxe.Int32 across the std library and improving stability of HL bytecode comparison tests, alongside a few repo/config maintenance updates.

Changes:

• Standardize 32-bit I/O-related APIs (readInt32, writeInt32, getInt32, setInt32, addInt32, and FPHelper i32/i64 helpers) to use haxe.Int32 in std and target-specific std implementations.
• Improve tests/hlcode normalization by also stabilizing integer constant pool references in HL dumps.
• Minor repo maintenance: tweak unit VS Code settings, extend .gitignore, and bootstrap hxcpp in the Copilot setup workflow + document it.

Reviewed changes

Copilot reviewed 34 out of 35 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/unit/src/unit/issues/Issue2718.hx	Adjust regression to use Map<UInt, String> consistently with UInt keys.
tests/unit/.vscode/settings.json	Disable Haxe formatOnSave for the unit tests workspace settings.
tests/hlcode/src/Macro.hx	Normalize int R,@N constant pool refs in HL dump comparisons.
std/python/io/IOutput.hx	Change writeInt32 parameter type from Int to Int32.
std/python/io/IInput.hx	Change readInt32 return type from Int to Int32.
std/python/_std/sys/io/FileOutput.hx	Update override signature to writeInt32(x:Int32).
std/python/_std/sys/io/FileInput.hx	Update override signature to readInt32():Int32.
std/python/_std/haxe/io/FPHelper.hx	Use Int32 for i32 conversions and i64 low/high parameters.
std/php/_std/haxe/io/FPHelper.hx	Use Int32 for i32 conversions and i64 low/high parameters.
std/php/_std/haxe/io/BytesBuffer.hx	Change addInt32 to accept Int32.
std/php/_std/haxe/io/Bytes.hx	Change getInt32/setInt32 to Int32.
std/lua/_std/haxe/io/FPHelper.hx	Use Int32 for i32 conversions and i64 low/high parameters.
std/js/_std/haxe/io/BytesBuffer.hx	Change addInt32 to accept Int32.
std/js/_std/haxe/io/Bytes.hx	Change getInt32/setInt32 to Int32.
std/java/lang/Integer.hx	Add missing extern overload for Integer.toUnsignedString(int).
std/hl/_std/haxe/io/FPHelper.hx	Use Int32 for i32 conversions and i64 low/high parameters.
std/hl/_std/haxe/io/BytesBuffer.hx	Change addInt32 to accept Int32.
std/hl/_std/haxe/io/Bytes.hx	Change getInt32/setInt32 to Int32.
std/haxe/io/Output.hx	Change writeInt32 signature to take Int32.
std/haxe/io/Input.hx	Change readInt32 signature to return Int32.
std/haxe/io/FPHelper.hx	Use Int32 for i32 conversions and i64 low/high parameters.
std/haxe/io/BytesOutput.hx	Update override signature to writeInt32(x:Int32) (Flash optimized path).
std/haxe/io/BytesInput.hx	Update override signature to readInt32():Int32 (Flash optimized path).
std/haxe/io/BytesBuffer.hx	Change addInt32 to accept Int32.
std/haxe/io/Bytes.hx	Change getInt32/setInt32 to Int32; use imported Int64 in getInt64/setInt64.
std/eval/_std/haxe/io/FPHelper.hx	Update extern signatures to use Int32 for i32 helpers and i64 parts.
std/eval/_std/haxe/io/BytesBuffer.hx	Update extern addInt32 signature to haxe.Int32.
std/eval/_std/haxe/io/Bytes.hx	Update extern getInt32/setInt32 signatures to haxe.Int32.
std/cpp/_std/haxe/io/FPHelper.hx	Use Int32 for i32 conversions and i64 low/high parameters.
std/cpp/_std/haxe/io/Bytes.hx	Change getInt32/setInt32 to Int32.
std/StringTools.hx	Remove Flash-specific hex() implementation, using the common bitwise version.
src/typing/functionArguments.ml	Adjust default-arg typing to use cast_or_unify and optionally run analyzer before constant check.
.gitignore	Ignore generated doc output under tests/docgen/cpp/ and extra/doc/.
.github/workflows/copilot-setup-steps.yml	Bootstrap hxcpp (haxe compile.hxml) during Copilot setup to avoid interactive hang.
.github/copilot-instructions.md	Document hxcpp bootstrapping requirement and troubleshooting guidance.