i.e., css::uno::Any function template specializations

  Any::has<Any>() const
  Any::get(Any const &) const
  operator >>=(Any const &, Any &)
  operator <<=(Any &, Any const &)

that don't make much sense (the first is always true, the rest can be replaced
with operator =, which additionally supports move semantics).  For 3rd-party
compatibility, do this only for LIBO_INTERNAL_ONLY, however.

However, some generic template code did benefit from operator >>= working also
for Any, so make up for that with a new (LIBO_INTERNAL_ONLY, given that
operator >>= still covers if fine for !LIBO_INTERNAL_ONLY) fromAny,
complementing the existing toAny.

Change-Id: I8b1b5f803f0b909808159916366d53c948206a88
Reviewed-on: https://gerrit.libreoffice.org/30022Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>