The SCN_AUTOCSELECTIONCHANGE notification was added in Scintilla 4.0 to
notify an application when a new item is selected in an autocompletion
or user list. However the version of Scintilla currently used is 3.7.2,
so this potentially useful notification is not available.
These changes allow an event corresponding to this notification to be
generated completely in the wxWidgets portion of wxSTC. If the Scintilla
library is ever updated to 4.0 or later, only one method should need to
be modified let Scintilla generate the event instead.
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