[Bf-committers] Moving to Python-3.8

[Mikhail Rachinskiy]

There are inconsistencies with other libraries too:

OpenVDB
VFX Platform 7.x
Blender 5.1

OpenEXR
VFX Platform 2.4.x
Blender 2.3.0

What about those? We stick to Python 3.7 but ignore other libraries?
Who currently supports VFX Platform?
As far as I know the latest version of Maya 2019 comes with Python 2.7.

While Python 3.8 got some neat optimizations:
* 40% faster calling globals.
* 20–50% sped up calling some simple builtin functions and methods.
* Doubled the speed of class variable writes.

We get these (and a few more) optimisations for free just from updating to
3.8.

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Mikhail Rachinskiy