feat boost.stacktrace: support import std (#231)

Support build with `import std;`. Add Github CI pipeline


---------

Co-authored-by: Fedor Osetrov <fdr400@Fedors-MacBook-Pro.local>

Update copyright years

Update copyright years

Fix URL in libbacktrace_impls.hpp (#214)

The double slash in the URL redirects to the bugzilla main page.

Fix URL in libbacktrace_impls.hpp (#214)

The double slash in the URL redirects to the bugzilla main page.

Fix stacktrace_from_exception builds with MinGW (#206)

Fixes #196

Fix stacktrace_from_exception builds with MinGW (#206)

Fixes #196

Fix stacktrace_from_exception builds with MinGW (#206)

Fixes #196

fix setting custom b2 feature from CLI (#194)

Fix stacktrace_from_exception CMake builds (#191)