Pothos::Object support binary serialization

[guruofquality]

Make use of binary serialization in Pothos::Object::serialize() and Pothos::Object::deserialize(). Binary serialization is faster.

Currently we use the portable text serialization, but there are many cases when binary is acceptable (for example same host, same architecture).

• This will require adding a parameter to de/serialize() to specify binary vs text. An API change

[guruofquality]

Follow up tasks:

• enableBinary() method for network source/sink blocks
• binary compatibility detection and enabling binary in network blocks in https://github.com/pothosware/pothos-library/blob/master/lib/Framework/TopologyNetworkFlows.cpp

[guruofquality]

I found a portable serialization from EOS that is an additional Boost archive. It claims to support binary serialization across architectures. I was able to test it between amd64 linux and arm32 linux. The code is now included as part of pothos-serialization. Modifications were needed to build it in properly.

• merge https://github.com/pothosware/pothos/commit/2865b4e380eeebfdba051110f5fe639e3e38a6fe
• eos portable archive: https://epa.codeplex.com/