Revert "Hide implementation details into ofxhParam.cpp so the host doesn’t have to be aware of the existence of the static member"

This reverts commit 8fb58d81579debb7fbeed23e417cc5e617860fb1.
Revert "Changed the way the parameters type is recognised. The old  static C “TypeMap” is now a class which allows for more flexibility : i.e: to add new standard types."

This reverts commit c9b1eca8f1e971e86e15477a0c12bd838817460a.
add kOfxParamTypeParametric to the list of standard parameters (the host still may or may not support the corresponding suite)