pjson 1.0 public release

[jdpraveen]

Added

• Introduced the versioned C++11 API for pjson 1.0, including compile-time
  version macros and pjson::getVersion().
• Added strict RFC 8259 DOM and SAX parsing from strings, byte spans, and
  streams, with structured line/column diagnostics, duplicate-key policies,
  and configurable input, node, and nesting limits.
• Added configurable compact and pretty serialization, direct stream output,
  non-ASCII escaping, key-order selection, and output-size limits.
• Added non-mutating lookup and strict typed access, including negative array
  indexing, borrowed string views, type predicates, container queries, erase,
  clear, swap, and deep structural equality.
• Added RFC 6901 JSON Pointer lookup, atomic RFC 6902 JSON Patch, and atomic
  RFC 7396 Merge Patch with structured errors and resource budgets.
• Added a documented JSON Schema subset with local references, object and
  composition vocabularies, known string formats, collected errors, exact
  numeric comparisons, and configurable validation budgets.
• Added allocator-aware DOM construction, parsing, copying, and ownership with
  provenance-preserving deletion.
• Added relocatable CMake and pkg-config packages, the pjson::pjson target,
  Conan 2 and vcpkg recipes, and consumer installation tests.
• Added tutorials, runnable examples, migration guides, generated API
  documentation, comparative benchmarks, cross-platform CI, sanitizer and
  conformance testing, and four libFuzzer/OSS-Fuzz targets.
• Added security, release, versioning, licensing, governance, and contributor
  documentation, GitHub contribution templates, and REUSE licensing checks.

Changed

• Parsing is now always RFC 8259-strict and rejects duplicate object keys by
  default; callers may explicitly keep the first or last duplicate.
• Integer and floating-point values now use int64_t and double
  representations and APIs instead of int and float.
• Compact serialization now emits no insignificant whitespace, while pretty
  serialization uses conventional nested indentation instead of the previous
  key-aligned format.
• Tree serialization, copying, equality comparison, destruction, and deep
  Merge Patch traversal now avoid recursive whole-tree walks.
• CMake builds repository tests, examples, and benchmarks by default only for
  top-level developer builds; add_subdirectory() consumers receive just the
  library unless they opt in.
• The public header is declaration-focused, with implementation helpers kept
  in the library source.

Fixed

• Correctly escape JSON strings and object keys and decode JSON escapes,
  Unicode code points, and surrogate pairs so empty and escaped strings
  round-trip.
• Reject malformed, truncated, trailing-garbage, invalid UTF-8, invalid escape,
  invalid number, and out-of-range numeric input without exposing partial parse
  results.
• Correct negative array indexing and prevent pathological indexed access from
  causing unbounded array growth.
• Preserve numeric kind and round-trip finite binary64 values, and compare
  mixed integer/double values exactly beyond the binary64 exact-integer range.
• Correct schema Unicode-length counting, numeric-bound and multipleOf
  precision behavior, malformed keyword handling, format validation, and
  speculative combinator error reporting.
• Preserve destination state and structured errors on allocation, output-budget,
  and Patch/Merge Patch failures.

Security

• Added bounded parser, serializer, Patch/Merge Patch, and schema-validation
  work to limit depth, memory and output amplification, reference traversal,
  regular-expression backtracking, and diagnostic growth for untrusted input.
• Added strict UTF-8 and escape validation, safe duplicate-key defaults, regex
  validation and caching, constant-space speculative validation, and atomic
  mutation behavior.

Removed

• Removed the raw-pointer CreateFromString() parsing API in favor of
  allocator-aware parse() APIs returning pjson::unique_ptr.
• Removed mutable container exposure and coercive accessors: PJSONARRAY,
  PJSONMAP, getArray(), getMap(), getInt(), getFloat(), getBool(),
  getString(), at(), getIfExist(), and getArrayValues().
• Removed the standalone JSON/Base64 encoding and decoding helpers.
• Removed int, float, C-string-vector, and corresponding vector convenience
  assignment/append overloads; use explicit int64_t, double, and supported
  vector types.
• Renamed the public type tags jsonNumberFloat and jsonMap to
  jsonNumberDouble and jsonObject.