wix: add env variable and customize UI
wix: add env variable and customize UI

ylatuya/cerbero,AlertMe/cerbero,nirbheek/cerbero,shoreflyer/cerbero,GStreamer/cerbero,cee1/cerbero-mac,brion/cerbero,GStreamer/cerbero,lubosz/cerbero,centricular/cerbero,davibe/cerbero,fluendo/cerbero,jackjansen/cerbero-2013,sdroege/cerbero,multipath-rtp/cerbero,EricssonResearch/cerbero,BigBrother-International/gst-cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,EricssonResearch/cerbero,atsushieno/cerbero,superdump/cerbero,jackjansen/cerbero-2013,AlertMe/cerbero,ikonst/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,atsushieno/cerbero,nirbheek/cerbero,GStreamer/cerbero,nirbheek/cerbero,ikonst/cerbero,flexVDI/cerbero,ford-prefect/cerbero,cee1/cerbero-mac,shoreflyer/cerbero,jackjansen/cerbero,justinjoy/cerbero,ylatuya/cerbero,EricssonResearch/cerbero,multipath-rtp/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,multipath-rtp/cerbero,davibe/cerbero,superdump/cerbero,nzjrs/cerbero,shoreflyer/cerbero,fluendo/cerbero,ramaxlo/cerbero,ramaxlo/cerbero,ikonst/cerbero,fluendo/cerbero,multipath-rtp/cerbero,GStreamer/cerbero,BigBrother-International/gst-cerbero,nicolewu/cerbero,ramaxlo/cerbero,superdump/cerbero,shoreflyer/cerbero,flexVDI/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,atsushieno/cerbero,brion/cerbero,jackjansen/cerbero,AlertMe/cerbero,brion/cerbero,jackjansen/cerbero-2013,ikonst/cerbero,cee1/cerbero-mac,EricssonResearch/cerbero,brion/cerbero,nirbheek/cerbero-old,brion/cerbero,davibe/cerbero,centricular/cerbero,flexVDI/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,flexVDI/cerbero,jackjansen/cerbero,nicolewu/cerbero,ramaxlo/cerbero,ford-prefect/cerbero,atsushieno/cerbero,ikonst/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,justinjoy/cerbero,ylatuya/cerbero,nirbheek/cerbero-old,lubosz/cerbero,nicolewu/cerbero,ylatuya/cerbero,flexVDI/cerbero,jackjansen/cerbero-2013,sdroege/cerbero,OptoFidelity/cerbero,nzjrs/cerbero,AlertMe/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,nirbheek/cerbero-old,multipath-rtp/cerbero,OptoFidelity/cerbero,fluendo/cerbero,lubosz/cerbero,sdroege/cerbero,fluendo/cerbero,nzjrs/cerbero,ford-prefect/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,nirbheek/cerbero-old,OptoFidelity/cerbero,lubosz/cerbero,shoreflyer/cerbero,BigBrother-International/gst-cerbero,justinjoy/cerbero,ramaxlo/cerbero,jackjansen/cerbero,BigBrother-International/gst-cerbero,superdump/cerbero,justinjoy/cerbero,nirbheek/cerbero,sdroege/cerbero,jackjansen/cerbero-2013,centricular/cerbero,nzjrs/cerbero,GStreamer/cerbero,nzjrs/cerbero,BigBrother-International/gst-cerbero,centricular/cerbero,freedesktop-unofficial-mirror/gstreamer__cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,atsushieno/cerbero,freedesktop-unofficial-mirror/gstreamer__sdk__cerbero,centricular/cerbero,EricssonResearch/cerbero,ford-prefect/cerbero,cee1/cerbero-mac,davibe/cerbero,OptoFidelity/cerbero,freedesktop-unofficial-mirror/gstreamer-sdk__cerbero,AlertMe/cerbero,sdroege/cerbero