Mark `TypeInfo` as `in` in aaA.
Mark aaA function arguments with `in` and `inout`.
Mark aaA functions with `pure`, `nothrow`, and friends.
Apply aaA function signature changes to `object` module.
Override `equals` in `TypeInfo_AssociativeArray`.

Fixes part of Issue 10380.

Issue URL: http://d.puremagic.com/issues/show_bug.cgi?id=10380
Make rest `TypeInfo`s `const` in aaA functions.
Remvoe redundant aaA functions attributes.
Add const `values`/`keys` in `AssociativeArray(Key, Type)` wrapper.
Merge pull request #523 from denis-sh/override-`equals`-in-`TypeInfo_AssociativeArray`

Override `equals` in `TypeInfo_AssociativeArray`.