charts: refactor overlay text to @runtime columns

This is a first pass at cleaning up the overlay content rendering
with an eye towards enabling runtime configuration of which
columns are present and their layout.

Nothing is runtime configurable yet, but this changes the drawing
to at least be data-driven using two arrays of column structs,
one for the list of active processes in the upper portion of the
chart, and another for the lower "snowflakes" exited
processes/threads portion.

0 files changed, 0 insertions, 0 deletions