Make 12.2.0 releasev12.2.0

Do the opposite of what other people are doing and make menuconfig.py
Python 2-compatible. Turns out it's not that tricky after all, and it
makes everything consistently Python 2/3-compatible and streamlines
things.

 - Commit 41b5891 ("menuconfig: Get rid of 'nonlocal'")

 - Commit b2e211d ("menuconfig: Fall back on getch() when get_wch()
   isn't available")

 - Commit c3162be ("menuconfig: Only decode curses.erasechar() on Python
   3")

 - Commit fe6ed99 ("menuconfig: Import print_function for Python 2
   compatibility")

 - Commit c209188 ("menuconfig: Have hashbang point to 'python' instead
   of 'python3'")

 - Commit d577865 ("Remove Python 3 menuconfig special-casing from
   Makefile patch")

 - Commit 319f7f0 ("Update various comments now that menuconfig is
   Python 2-compatible")

 - Commit 5fbd70e ("Update setup.py now that menuconfig is Python
   2-compatible")

Also investigate exactly what the Python version requirements are and tweak
and document things a bit:

 - Commit e0baa79 ("Tweak python_requires to 2.7/3.2+")

 - Commit 3a772a6 ("Add a section on version compatibility to the
   README")

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