eic_data.yaml: static_casting constructors from double

To avoid narrowing warnings and errors which are fully anticipated by the choice of data model, we introduce here e.g.

        Vector2f(double aa, double bb)\n
          : a{static_cast<float>(aa)},b{static_cast<float>(bb)} {}\n

Other changes:

• initializer lists in constructors
• bugfix in Cov4f

assigned to @wdconinc

added 1 commit

• 9a46ffa6 - Bugfix in Cov4f with vt

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merged