OverLordGoldDragon / see-rnn / 311

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TF 2.3 compatibility; 'SCALEFIG' env flag

**FEATURES**:

  - Compatibility with TensorFlow 2.3.0 (see "TESTS")
  - `os.environ['SCALEFIG']` (default `'1'`) will scale all drawn figures; specify as tuple `(w, h)` to scale width & height separately.

**BREAKING**:

  - TF 2.3.0 won't work with `keras`; this isn't `see_rnn`, this is breaking changes to some basic TF ops.
  - Changed default `os.environ['TF_KERAS']` to `'1'`

**TESTS**:

  - Discontinued support for `keras` TF2.3.0+; `keras` TF2.2.0 Graph is still tested, but may discontinue entirely in the future, or reinstate depending on how [Keras](https://github.com/keras-team/keras) proceeds
  - `tf.keras` now only tested with TF 2.3.0+

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