WIN32 Event Message Hook

TBD: This needs to be finished.


This implements a replacement for the "MsgBlaster" OCX. It is a kind of low level event message hook that allowed 4GL applications to see WIN32 event messages that are not otherwise exposed by the 4GL natively. The OCX has no UI, it is just a set of hooks for getting a call-back when certain events occur.

The features were implemented in #3769. The first public release is FWD v4.0.

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