Autoproject part

[Victor Röder]

Hi Robe and Amilcar!

As you might have seen, I have tried to restructure the code of 
autoproject a little bit to get a smaller autoprojectwidget.cpp.
What I would like to do is, to make the code a little bit more nicer to 
read. That begins with those Autoproject listview items (SubprojectItem, 
TargetItem, FileItem). In the code there are several places where the 
relative path of a subproject is obtained. It would be nicer to have a 
method relativePath() of the SubprojectItem class. But this is only one 
example of inner changes ...

For the GUI I had following things in mind:
Replace the two small toolbar buttons (New subproject, new target, 
subproject options, ... , New file, etc.) with actions that only deal 
with the view of subprojects, targets and files.
Examples:
1) A toggle button with which you can hide show "one type of target". 
blabla_DATA target for example.
2) A button with which you can easily jump to your active subproject/target
3) A button with which you can "flatten" your subprojects. I. e. the 
subproject tree view becomes a simple list of subprojects, but now every 
subproject has prepended it relative path to the project directory.
4) Maybe an option with which you can set the directories/subprojects 
you want to see in the upper half of the autoprojectwidget.

Nice to have would be drag and drop support :-).

What do you think about it?

Bye,
    Victor