Default x0: change from 0 to center of domain

[Dvermetten]

Current behavior seems to set X0 to the all 0 vector, instead of the center of the domain, which causes problems in some spaces (especially when 0 is not in the domain).

ModularCMAES/src/center_placement.cpp

Line 8 in 705a13c

p.adaptation->m = p.settings.x0.value_or(Vector::Zero(p.settings.dim));

[jacobdenobel]

this is fixed in #56