Add CloneFunction, a less stringy version of cloneFunction
Only generate body in lieu of the whole method, and use new CloneFunction
Remove vibe.internal.meta.codegen.cloneFunction
Remove private vibe.web.rest.generateRestInterfaceMethod
Merge pull request #871 from Geod24/simplify-codegen

Revamp vibe.internal.meta.codegen.cloneFunction
Avoid unecessary HTTPMethod -> string -> HTTPMethod conversion