* more examples

* flat_tensor::ranked

* raw_tensor::typed<R, r>

* rename as_ranked -> ranked

* rename raw_shape -> flat_shape

* [[gnu::unused]]

* more detailed exception

* invalid_type_reification

* make make_shape constexpr

* flatten

* batch and vectorize

* raw_tensor::{rank,size,dims}

* new header <ttl/flat_shape>

* ref,view for basic_raw_tensor

* <ttl/type>

* move type_encoder to ttl/

* std_except.hpp

* fix cuda raw tensor (#86)