For PA-cf material, forcing cooling for all outer
wall and using lower fan speed for infill and inner
wall can get more high strength.
Add this cooling strategy.
When set overhang fan threshold to be 0%, then bridge
and all outer wall will be force to cool with
the overhang fan speed.
Signed-off-by: salt.wei <salt.wei@bambulab.com>
Change-Id: Ideed1ac8690f1eeb68aad760678db76bb4dae8ec
47302b0cf9