Qt4 - Remove QFontDialog Dependency... We don't have some CONFIG_ITEM_FONT yet... Do we have complete fontconfig support btw ?

Qt4 - Preferences: avoid a few segfaults in the hotkeys selector. Avoid using QList of module_config_t and attack it from different classes. Avoid using some useless casts...

Qt4 - Using already defined configuration type. This is needed for finer control and differentiation between int and bool for the time being.

                           * Fix the "empty value, empty text" key bug.

Qt4 - Preferences. Introduction of a checkBoxListItem struct to handle (key, value for CheckBoxes) in order to implement completely ModuleList autogeneration. Modify the functions needed to generate the correct String Configuration. Complete Preferences should be functionnal now.

Qt4 - Complete preferences. Make ModuleList Clearer than it is now... Align SpinBox correctly. Make directory and file use 2 column instead of three.

Qt4 - Preferences. Add CONFIG_DIRECTORY_ITEM. Does not work, but does not harm. Why ? can a C++ guru explain me? thks!

Could you look please on that commit cause I don't understand if it is the good way to do it (I guess not) and why do I had to add this 'bool' to the methods.

zorglub, dionoea? 

Skeleton for modules list widgets in the prefs. I'm not working on it atm so i figure that it's best to commit what's already done.

* Add a CONNECT macro for simple signal->slot connections 
* Untested save support in simple preferences