Nested preprocessor variables

[wixbot]

I would like to see nested preprocessor variables implemented.

In my case, I would like to be able to create a variable for my project references like so;

Solution
|-ConsoleAppName
|
|-GuiAppName
|--Resources
|---Main.ico
|
|-Setup
|--ConsoleAppReference
|--GuiAppReference

$var.($(var.Cons).ProjectName) expands to "ConsoleAppName".
$var.($(var.Gui).ProjectDir)Resources\Main.ico expands to GuiAppName\Resources\Main.ico
$var.($(var.Gui).TargetPath) expands to GuiAppReference.TargetPath

This would allow users to set friendly names to their project references, and make template creation easier.

Originally opened by orangejello from http://sourceforge.net/p/wix/feature-requests/731/

[wixbot]

Originally changed by barnson
Area set to compiler
Release changed from Future to v4.x