(minor) Append override keyword to Trace::Listener derived classes.
[NDK] Add Android facility and LogTraceAdapter.
(refactoring) Rename some TraceListener to Adapter.
- Rename Trace::StdoutListener to StdoutAdapter
- Rename Windows::DebuggerTraceListener to Adapter.
Add Trace::ExistsBuiltinChannel().
- And it replaced the internal HasBuiltinChannel().