Touchup profiling

[albinahlback]

Should solve #2458 and #2468 (comment).

Printing memory usage on other platforms than macOS and Linux is unchecked.

[fredrik-johansson]

The added semicolons on TIMEIT and removal of SHOW_MEMORY_USAGE seem like gratuitous API breakage.

[albinahlback]

The added semicolons on TIMEIT and removal of SHOW_MEMORY_USAGE seem like gratuitous API breakage.

And I like it! It was very annoying before when automatic indentation broke because of the lack of semicolons.

[albinahlback]

I updated the documentation as well. @fredrik-johansson what is your opinion on this? I think this is final.

[fredrik-johansson]

It was very annoying before when automatic indentation broke because of the lack of semicolons.

Fair enough rationale.

[vneiger]

Thanks!