This improves readability a lot and prevent us from reinventing the wheel.

Fix the handling of string variable - store them as UTF-8 into the config variables, also convert the StringList values to an UTF8 string before putting them into a QVariant - which seems not to work if created from a "char *" - because later converterd QVariant->toString() isn't UTF8 like expected.
waveout.c forgott to convert string to UTF8 before storing in choice list

StringListConfigControl finish -> deal with empty ppsz_list_text, same like in wx widgets, use instead the short text

Enable the last parameter of the macros change_integer_list, change_string_list to supply a method to initialize update dynamic selectionlists inside the settings GUI allready on showing the gui. (f.e. the audio device list)

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

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

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.

 - Use module_Exists as appropriate
 - Rename module_FindName as module_Find

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

Qt4 - Preferences, improve a bit the Hotkeys. Preparatory work to merge the Hotkeys from SPrefs and AdvPrefs.

Qt4 - Simple prefs, re-do [22621], but removes all the connects for all the configcontrol, remove some functions, clean it, remove some dynamic_cast, but basically do the same.