GExperts IFDEF Expert support for include files

The GExperts IFDEF expert now supports include files.

GExperts IFDEF Expert

For each include file in the current unit it displays an additional tab containing all symbols defined in that include file with {$DEFINE }, {$UNDEF } and the usual disabled notation of these {.$DEFINE }, {.$UNDEF }. It searches for the include files in the search path of the project and – like the compiler – uses the first one it finds.