* tuple -> xla_tuple (+headers)

xla_get_tuple_element

get_tuple_element headers

adding get_tuple_element + fixes

get_tuple_element

XLAFunction; breaks tests

compiling libngraph.so w/ XLAFunction and Function; fixing tests is next

build & test fixes

formatting

m_arguments -> get_arguments (first step to hide m_arguments)

removing some get_arguments

get_arguments -> get_arguments_DEPRECATED

more DEPRECATED

formatting

m_arguments no more! at least technically

halfway

tests pass

xla_function.cpp/hpp

move defs into cpp files

get_input_argument -> get_input_op

formatting

* add xla_function.* and assert -> throw

* assert -> throw, remove cassert

* removing emitter.cpp; poor guy got left behind

* addressing feedback p1

* rename GetTupleElement -> GetOutputElement

* adding a comment to get_arguments_FOR_GRAPH_REWRITE_ONLY

* removing virtual off set_name