* build(cxx): align all builds on a C++14 baseline
CMake, Make, tests, tools, and examples now require C++14 so every supported build path shares the same minimum language level. The compiler checks and user-facing documentation reflect that baseline.
* fix(test): keep cores scoped to the failing test
Clear prior cores before each test binary. A passing death test can leave a core that would otherwise be used to diagnose an unrelated later failure.
* revert src/butil/type_traits.h
2. ThriftFramedMessage (no matter Cast<>-ed or not) can be sent/received as well so that building proxies of thrift is much easier.
3. ThriftFramedMessage::Cast<T> can be called multiple times with reasonable behaviors, even if T is changed.
4. Server-side errors are sent to client as TApplicationException instead of closing the connection.
5. Code in ThriftService::ProcessThriftFramedRequest() can throw exceptions which will be sent to client as errors as well.
6. Simplify ThriftClosure which does not need many stuffs inherited from NsheadClosure.
7. Port protocol-related patches to thrift_protocol.cpp which was changed before the patches.
8. Remove the unnecessary default malloc when constructing TMemoryBuffer.
9. Use TBinaryProtocolT instead of TBinaryProtocol to make read/write non-virtual, and remove the unnecessary shared_ptr on iprot/oprot.
10. request/response must be ThriftFramedRequest when protocol is thrift, which was not checked before.
11. Limit max length of thrift_method_name (to a reasonable large value) so that intermediate buffer can be allocated on stack directly.
12. Make ThriftFramedMessage uncopyable since the TBase* inside does not have a general copy function.
Removed thrift_binary_head.h and renamed thrift_binary_head_t to thrift_head_t which is in thrift_message.h
Adapt thrift 0.11 which uses shared_ptr defined in stdcxx.h
Simplify example/thrift_extension_c++ by roundrobin between processing by handler or directly.
Removed libbrpc_thrift.a, the objs are archived into libbrpc.a (and libbrpc.so) directly
Bright Chen