Project Headers

[David Nolden]

Currently Quickopen-Class und Quickopen-Function and Quickopen-File don't work 
correctly. The reason is that the project only reports the source-files to be 
part of the project, but not the headers, while the classes are defined in 
the headers, so they don't show up in the class list.

So we need to make a decision, should headers be officially part of the 
project, or should this be worked around somehow in the quickopen plugin?

greetings, David