v1.47.0
cmake: update .gitignore files
Remove remaining SPDY code from the integration tests.
Run nghttpx integration test with cmake build
nghttpx: Refactor code to build cert_tree, add SNI test
integration-tests: support out-of-tree tests
Fix typos
nghttpx: Add --require-http-scheme option
nghttpx: Change mruby script handling
integration: Add TLS key and certificate for testing
integration: Add PROXY protocol v2 tests
Build with GitHub Actions