Support both 32-bit and 64-bit types in UnityEnvironment #1471
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We check for the single brain case in UnityEnvironment by checking
for applicable non-dict types in the step arguments. However for ints
and floats we just use
np.int_andnp.float_for the check, whichare the defaults for your system.
This means if you are using an application (like baselines in #1448)
which uses the wrong int/float size an error will be thrown. This
change explicitly allows both 32 and 64-bit numbers.