T3202: setting to disable omitting retractions in support
Some users report that omitting the retractions causes print failures.
It might be machine/material dependant, so we need a user setting for this.
Omitting retractions was implemented somewhere in 2.5 or something, but it was never a setting.
We've since gotten some critique on this.
Signed-off-by: Alexei Dorofeev <email@example.com>