Develop barracuda tensor

[mantasp]

Bringing bucket of temp memory allocation optimizations:

• switched to Barracuda backed tensor across the board, helps to leverage allocators and reuse of the internal buffers
• added Barracuda 0.2.4 release, which bring another set of temp memory allocation fixes

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1 out of 2 committers have signed the CLA.

✅ chriselion
❌ Mantas Puida

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[chriselion]

@mantasp That merge conflict was due to fixing line endings in that file (#2208). IIRC it touched the whole file.

[mantasp]

@chriselion fixed!

[ervteng]

I tested all of the usual suspects (Visual, Discrete Actions (+ Branched), Continuous Actions, LSTM) and they all seem to work fine.