AIDA: allow operator== NULL for SmartHandle
RCORE: provide Aida::Any as "Any" in the Rapicorn namespace
RCORE: AIDA: fix NullSmartHandle.__aida_cast_types__() to allow type casts
Merge branch 'aida-cleanups'

* aida-cleanups:
  RCORE: AIDA: fix NullSmartHandle.__aida_cast_types__() to allow type casts
  RCORE: provide Aida::Any as "Any" in the Rapicorn namespace
  AIDA: allow operator== NULL for SmartHandle