5.6.0

Mostly a bugfix release for various issues that people reported or found (and generously provided fixes). Only addition is for early support of EcoStd introspection reporting (with a new stdinfo module).

• New: Add minimal https://ecostd.github.io/[EcoStd] support. Minimal being self introspection information output. -- René Ferdinand Rivera Morell
• Fix obsolete -ip option for intel-linux toolset. Replaced with -ipo. -- Amlal El Mahrouss
• Fix clang-win toolset initialization error, missing argument native from path.make, on machines where vswhere does not find a Visual Studio installation. The VS detection now includes Build Tools installs (vswhere -products *), and a missing VS install is no longer a hard error. -- Sam Darwin
• Fix intermittent crash in make1c() from dereferencing a null t->parents when updating includes of a just-created internal node. -- Sai Asish Y
• Fix parsing of Windows archive files larger than 2GiB. -- René Ferdinand Rivera Morell
• Add alpha to the architecture feature. -- Matt Turner
• Add python-numpy-include feature to support numpy while cross-compiling. -- Rob Woolley
• Autodetect <target-os> from compiler triplet for gcc/clang toolsets. -- Uilian Ries
• Fix generating Windows import libraries when linking shared libraries in clang-linux toolset. -- Uilian Ries
• Forward <linkflags> from using msvc toolset options to the linker. -- Uilian Ries
• Use getexecpath() on OpenBSD to detect the executable path. -- Brad Smith
• Avoid warnings about debug sym turning off optimization default for intel-linux toolset. -- René Ferdinand Rivera Morell
• Do not link pthread for Android on Python config. -- Uilian Ries
• Exclude iphone and appletv from rpath-os fallback rule. -- Uilian Ries