2.4.0

🚀 What's Changed

✨ Fluent Message Factory Builder API

• Code-first configuration without XML — a new MessageFactoryBuilder<T> provides a fluent, type-safe API for constructing fully-configured MessageFactory instances entirely in code.
• 🧩 Supports all configuration options previously available only through XML: headers, templates, parse maps, custom fields, composite fields, and all factory properties.
• 🔗 Template and parse-map inheritance via Extends(), with field-level override and exclusion support.
• 🏗️ New builder classes: MessageFactoryBuilder<T>, TemplateBuilder, ParseMapBuilder, and CompositeFieldBuilder.

var factory = new MessageFactoryBuilder<IsoMessage>()
    .WithEncoding(Encoding.UTF8)
    .WithHeader(0x0200, "ISO")
    .WithTemplate(0x0200, t => t
        .Field(3, IsoType.NUMERIC, "000000", 6)
        .Field(11, IsoType.NUMERIC, "000001", 6)
        .Field(41, IsoType.ALPHA, "TERMINAL", 8))
    .WithTemplate(0x0210, t => t
        .Extends(0x0200)
        .Field(39, IsoType.ALPHA, "00", 2))
    .WithParseMap(0x0200, p => p
        .Field(3, IsoType.NUMERIC, 6)
        .Field(11, IsoType.NUMERIC, 6)
        .Field(41, IsoType.ALPHA, 8))
    .WithParseMap(0x0210, p => p
        .Extends(0x0200)
        .Field(39, IsoType.ALPHA, 2))
    .Build();

📎 PR: #42

⚡ Performance: Zero-Copy Parsing, Span<T>, Bitmap128 & Allocation Reductions

• 🧮 Bitmap128 struct backed by UInt128 replaces BitArray for field-presence tracking — significantly faster bit operations with zero heap allocations.
• 🔬 Span<T> and ReadOnlySpan<T> used throughout parsing and encoding, enabling zero-copy byte/string conversions and eliminating intermediate array allocations.
• 🔄 Zero-copy byte utilities (Bytes extensions) using MemoryMarshal.Cast for reinterpreting between byte[] and sbyte[] without copying.
• 🧵 Stringx extensions with GetSignedBytes() overloads that encode directly into destination buffers, plus ArrayPool<T> pooled variants for hot paths.
• 💾 EncodingCache to avoid repeated encoding lookups.
• 📦 Reorganised internal utilities from NetCore8583.Util → NetCore8583.Extensions namespace for clearer separation.
• 🔧 All field parsers, IsoMessage, IsoValue, MessageFactory, and codec classes updated to use the new span-based APIs.

📎 PR: #41

⚠️ Breaking Changes

• The NetCore8583.Util namespace has been reorganised into NetCore8583.Extensions. If you reference types like HexCodec, Bcd, Arrays, OsUtil, Enumm, DictionaryExtensions, or ParseException directly, update your using statements accordingly.
• 🗑️ Removed: ByteUtil, DateUtil, StringUtil, DictionaryExtensions, Enumm, and ParseException from NetCore8583.Util (replaced by equivalents in NetCore8583.Extensions).

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Full Changelog: 2.3.0...2.4.0