v0.5.3

Runtime extension composition

Pnlx\Runtime::compose([Libsdl::class, Sdlimage::class]) fuses several generated
extensions into one shared FFI scope, so a \FFI\CData returned by one package
(e.g. an SDL2_image surface from IMG_Load) can be passed straight into another
package's function (SDL_CreateTextureFromSurface). Previously each extension
booted its own FFI::cdef scope and PHP FFI rejected cross-scope CData.

• Members' generated cdefs are merged (Pnlx\FFI\CdefComposer) and their libraries
  co-loaded into a single NativeLibrary (NativeLibrary::composite()); each member
  class adopts that scope (AbstractExtension::pnlxAdoptNativeLibrary()), so its
  generated methods keep marshalling and return-wrapping unchanged — only the native
  scope is shared.
• Returns a Pnlx\ComposedScope that also proxies calls
  (Runtime::compose([A, B])->some_function(...)); plain A::fn() / B::fn() static
  calls share the scope too.

Code generation

• Pointer-to-const scalars (const int *, const double *) are now treated as
  read-only input arrays instead of writable by-reference out-params — fixes passing
  null where PHP cannot pass a literal by reference (libopenal/libswscale).
• Structs defined with a body always get a Types\* wrapper now, even when no
  function names them, so a struct handed back through void * (hiredis's
  redisReply) can be re-wrapped.
• Generated enums gain toInt() (alias of ->value), mirroring the integer-wrapper
  API of scalar returns.
• Typed wrappers reinterpret() an incoming \FFI\CData to their own type.

Native-library resolution

• pkg-config lookup also tries a lib-prefixed module name (enet -> libenet).
• Headers living under include/<pkg>/ add the include root to the parse path, so
  angle includes carrying the subdir prefix resolve (lzo's <lzo/lzodefs.h>).

Build / runtime

• The embedded PHP SDK (include_dir!) is rebuilt whenever any src/sdk file
  changes, via a build-script content fingerprint — SDK fixes always ship in the
  binary instead of silently going stale.
• Pnlx\Util::isNull() added as a static null-pointer check for generated code.