(the right side of enlarged images was not scaled properly)

* Fixed a tooltip
* Removed a debug message

* ALL: fixed some gettext stuff in the subtitles-options-dialogue, cosmetics to the text-fields, etc.

* Re-implemented sub-fps for SubRIP.
* Use 50ms increments for hotkeys

* Added channel downmixing support to NEWS

* Re-enabled string translation for wizard
* Fixed wizard strings
* internationalized some strings that weren't

  - added a demuxer for SDP files. this is a temporary submodule to handle SDP files with UDP streams for so long as liveMedia doesn't support these yet.

* src/misc/httpd.c: use dummy wrapper if httpd is disabled.
* src/misc/vlm.c: use dummy wrapper if vlm is disabled.
* modules/control/http.c, telnet.c: properly handle cases where http/vlm is not available.