Remove wolf::Scalar and use double instead

And fix all Eigen typedefs that rely on it.

added Code organization External API update To Do (release) labels

created merge request !328 (merged) to address this issue

mentioned in merge request !328 (merged)

assigned to @joanvallve

Meeting agreement: Wolf is colmajor, only rowmajor auxiliar matrix will be generated in analytic factors when calling evaluate().

Assigned to @joanvallve: changes in factorBase and so on..

added ~209 label and removed To Do (release) label

closed via merge request !328 (merged)