[Lazarus] Documenting constant values

[Hans-Peter Diettrich]

Delphi introduces very many constants, corresponding to WinAPI defines. 
The user has no idea which constants can be used in which place, because 
the argument types are almost DWORD - TCursor is a nice exception.

Can we agree to define range types or simple type alias for *all* such 
arguments, so that all related constants can be described together, in 
one single place? See the documentation on TCursor.

DoDi