show only the windows that were visible before

- allow for libvlc_exception_t to be NULL in APIs
- remove X11 references from libvlc, as it breaks MacOS X

* Added the QuickTime RTSPtext redirect system. uses m3u, even though they are not related.
* Added the WM Server [Reference] redirects to the pls playlist demux. it's also INI based.

This fixes #690

- intf_UserProgress* takes an additional argument now. use it to provide the time to go (in sec) until the process will be finished. Provide 0, if you don't have such info. The interface will hide the respective text-field.
- intf_UserProgressIsCancelled can be called by the module which triggered the interaction dialogue on a regular interval, to check if the user cancelled the dialogue or not. This is for dialogues with an optional cancel-button only (like the modal progress panel), so it doesn't replace p_dialog->i_return = DIALOG_CANCELLED which is for yes/no-style dialogues
- intf_UserOkayCancel was removed in favour of an enhanced intf_UserYesNo
- intf_UserYesNo takes 3 additional arguments now to get the custom captions of the default (~Yes), alternate(~No) and one optional button(~Cancel). This provides a better interface experience for the user and is more compliant with OSX's HIGL. The interface automatically hides the 3rd button, if NULL is given.

if (vout_Control VOUT_REPARENT is called giving a Drawable in args)
then 
     that Drawable is used as new parent
otherwise
     DefaultRootWindow will be the parent
     

+ some misc test cleanup

CSS is not yet disabled as it is hidden from us by libdvdnav/libdvdplay

- boostrap: make configure.ac happy when detecting contribs build on Cygwin
- Makefile: cleanup, fixed extraction of files containing invalid characters (on DOS LFN), gpg-error compiling

    .pc hqve been fixed upstream
    delete empty win32 patch
    temporarly disable install patch. it works fine without on debian and macOSX. FC4 to be investigated