v0.1.0

Added

• PlaFile.DetectKind tells the container shared by .pla and .pln files (ROF FDB ) and .bimx files (BIMx)
  apart by their first bytes.
• PlaDocument opens a .pla or .pln file or a seekable stream without loading the whole file. It exposes the length,
  the header (FdbHeader: layout version, format version, the raw field at offset 12 and the first 64 raw bytes) and the
  BL and DY blocks found by scanning from offset 32 (PlaBlock: offset, tag, id, kind, version, flags, size class,
  mode, GUID, packed and unpacked size, extra field, payload offset).
• PlaDocument.ReadPayload decodes payloads stored raw (mode 0) or with zero masks (mode 1). Mode 2 (LZ) is recognised
  and reported with NotSupportedException; a payload that does not decode to its declared size, or a cut file, is
  reported with InvalidDataException.
• PlaDocument.FindDirectories searches raw blocks for object directories of 30-byte records (ObjectDirectoryRecord:
  class number, position, count, object GUID) and reports how the records abut, overlap or repeat a position
  (ObjectDirectory). The meaning of position and count and the names of the classes are not known.
• BimxDocument opens a .bimx file or a seekable stream, measures the PNG cover image that follows the signature,
  reads it with ReadCover (up to 64 MiB) and reports where the rest of the content begins. That content is not
  interpreted.
• The plaio command line tool (package PlaIO.Cli) with the commands info, blocks and directory, JSON output of
  the directory records with directory --out, and the exit codes 0 (done), 1 (usage error) and 2 (input or output
  cannot be used).
• Targets .NET 8 and .NET 10, with no package dependencies. The library never writes to the console.