Generic programming with extensible transformations

Yet another library for generic programming. Provides syntax extensions both for camlp5 and PPX which allow decoration of type declarations with following compile-time code generation. Provides the way for creating plugins (compiled separately from the library) for enchancing supported type transformations.

Strongly reminds the visitors library from François Pottier. During desing of a library of these kind there many possible design decision and in many cases we decided to implement the decision opposite to the one used in visitors.

P.S. Since 2023 development team is no longer associated with JetBrains Research