charts: render mem row-columns in the overlay text

This adds overlay text rendering of the per-proc mem rows.

It's not entirely complete yet, the main missing piece is the
hierarchy branches need to get drawn into the per-proc mem row.
It's not readily possible yet, since there's no way to inherit
the offset of the tree column from the cpu row-column - and
there's no way or the mem row-column to replicate the same
horizontal offset, since it lacks the other columns like
uesr/sys/wall to cumulatively get to the same offset.

0 files changed, 0 insertions, 0 deletions