Instead of allowing leaks when parsing arguments, always cleanup before
calling exit(). This impacts -a (animation player), --help & --version
arguments, as well as scripts executed via --python which meant tests
that ran scripts could leak memory without raising an error as intended.
Avoid having suppress warnings & rationalize in code-comments when
leaking memory is/isn't acceptable, any leaks from the animation-player
are now reported as well.
This change exposed leaks: !140182, !140116.
Ref !140098
f8eec542f4