Correctly set generator mode.
Improved override/overload lookup

The lookup for function overrides and overloads now tries to work
around extension case mismatches (e.g. IBM vs Ibm). This fixes a few
specific cases of missing overrides.
New Add() methods analogous to FunctionCollection
Clear qualifier path when changing type

This fixes a bug where overriding an enum parameter with a non-enum
parameter would result in the wrong qualifier path.
ES11 compatibility overloads (WIP1)
Regenerated bindings