Add a simple qSupported packet, fix a bug in decode_binary_data(), 
add a new 'x' packet for reading data in binary format.  Document
the 'x' packet.  
<rdar://problem/16032150> 


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@208051 91177308-0d34-0410-b5e6-96231b3b80d8