Migrate tensorflow 1.X portions of tealayers to tensorflow 2.X

[mackncheesiest]

We still rely a bit on the tf.compat.v1 interface
(ex:

RANC/software/tealayers/tealayer2.0/tealayer2/tea.py

Line 177 in c7eb1d4

with tf.compat.v1.get_default_graph().gradient_override_map({"Round":"CustomRound"}):

)

We should work to move away from that