[Fix] Producer clone and Tensor copy

Context

Closes #207 (closed)

Major modifications

• Tensor

  • add compound assignment operator (+=, -=, *=, /=) with Tensor and arithmetic values
  • add operator(+, -, *, /) with arithmetic values
  • add friend symetric operator (+, -, *) with arithmetic values
  • add fmt parsing function (now you can display a Tensor with fmt)
  • Add move assignment operator
  • Fix 'Tensor::clone()' if original Tensor has no implementation
  • Change Tensor::operator= behaviour to always perform a shallow copy in case of copy constructor/assignment operator calls

• Pop_Op: fix kernel that should not be inplace

• Data: add copy/move constructor/assignment operator