Wrap all AbstractDDEFunction which have the expected fields

[wi11dey]

Since now there are more subtypes of AbstractDDEFunction than just DDEFunction, ODEFunctionWrapper is changed to accept any AbstractDDEFunction f that fits the interface:

• isinplace(f) returns Bool
• f.f is defined as the one function that contains the entire DDE.
• f.mass_matrix is defined
• f.analytic is defined
• f.jac is defined
• f.jac_prototype is defined
• f.sparsity is defined
• f.Wfact is defined
• f.Wfact_t is defined
• f.paramjac is defined
• f.syms is defined
• f.colorvec is defined

(i.e. any AbstractDDEFunction that "looks like" a regular DDEFunction)

Companion PR of https://github.com/SciML/SciMLBase.jl/pull/14.

[ChrisRackauckas]

Yup great!

AbstractDDEFunction f that fits the interface:

With the SciMLBase refactor I plan to go back through and try and document all of these interfaces. It'll take a bit, but I think it'll help the ecosystem a ton.