Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass

Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass

Original commit message from CVS:
* ext/alsaspdif/alsaspdifsink.h:
* ext/amrwb/gstamrwbdec.h:
* ext/amrwb/gstamrwbenc.h:
* ext/amrwb/gstamrwbparse.h:
* ext/arts/gst_arts.h:
* ext/artsd/gstartsdsink.h:
* ext/audiofile/gstafparse.h:
* ext/audiofile/gstafsink.h:
* ext/audiofile/gstafsrc.h:
* ext/audioresample/gstaudioresample.h:
* ext/bz2/gstbz2dec.h:
* ext/bz2/gstbz2enc.h:
* ext/dirac/gstdiracdec.h:
* ext/directfb/dfbvideosink.h:
* ext/divx/gstdivxdec.h:
* ext/divx/gstdivxenc.h:
* ext/dts/gstdtsdec.h:
* ext/faac/gstfaac.h:
* ext/gsm/gstgsmdec.h:
* ext/gsm/gstgsmenc.h:
* ext/ivorbis/vorbisenc.h:
* ext/libfame/gstlibfame.h:
* ext/nas/nassink.h:
* ext/neon/gstneonhttpsrc.h:
* ext/polyp/polypsink.h:
* ext/sdl/sdlaudiosink.h:
* ext/sdl/sdlvideosink.h:
* ext/shout/gstshout.h:
* ext/snapshot/gstsnapshot.h:
* ext/sndfile/gstsf.h:
* ext/swfdec/gstswfdec.h:
* ext/tarkin/gsttarkindec.h:
* ext/tarkin/gsttarkinenc.h:
* ext/theora/theoradec.h:
* ext/wavpack/gstwavpackdec.h:
* ext/wavpack/gstwavpackparse.h:
* ext/xine/gstxine.h:
* ext/xvid/gstxviddec.h:
* ext/xvid/gstxvidenc.h:
* gst/cdxaparse/gstcdxaparse.h:
* gst/cdxaparse/gstcdxastrip.h:
* gst/colorspace/gstcolorspace.h:
* gst/festival/gstfestival.h:
* gst/freeze/gstfreeze.h:
* gst/gdp/gstgdpdepay.h:
* gst/gdp/gstgdppay.h:
* gst/modplug/gstmodplug.h:
* gst/mpeg1sys/gstmpeg1systemencode.h:
* gst/mpeg1videoparse/gstmp1videoparse.h:
* gst/mpeg2sub/gstmpeg2subt.h:
* gst/mpegaudioparse/gstmpegaudioparse.h:
* gst/multifilesink/gstmultifilesink.h:
* gst/overlay/gstoverlay.h:
* gst/playondemand/gstplayondemand.h:
* gst/qtdemux/qtdemux.h:
* gst/rtjpeg/gstrtjpegdec.h:
* gst/rtjpeg/gstrtjpegenc.h:
* gst/smooth/gstsmooth.h:
* gst/smoothwave/gstsmoothwave.h:
* gst/spectrum/gstspectrum.h:
* gst/speed/gstspeed.h:
* gst/stereo/gststereo.h:
* gst/switch/gstswitch.h:
* gst/tta/gstttadec.h:
* gst/tta/gstttaparse.h:
* gst/videodrop/gstvideodrop.h:
* gst/xingheader/gstxingmux.h:
* sys/directdraw/gstdirectdrawsink.h:
* sys/directsound/gstdirectsoundsink.h:
* sys/dxr3/dxr3audiosink.h:
* sys/dxr3/dxr3spusink.h:
* sys/dxr3/dxr3videosink.h:
* sys/qcam/gstqcamsrc.h:
* sys/vcd/vcdsrc.h:
Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass