inspect: allow to get plugin-install-info for all installed plugins
inspect: allow to get plugin-install-info for all installed plugins

If no plugin is given, print the info for all plugins. This can be used as a
starting point to generate a profile about what the gstreamer installation can
potentialy handle (e.g. for MTP or DLNA).

mparis/gstreamer,cfoch/gstreamer,StreamUtils/gstreamer,magcius/gstreamer,mrchapp/gstreamer,lovebug356/gstreamer,Distrotech/gstreamer,surround-io/gstreamer,magcius/gstreamer,ensonic/gstreamer,surround-io/gstreamer,ylatuya/gstreamer,ahmedammar/platform_external_gst_gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,ahmedammar/platform_external_gst_gstreamer,justinjoy/gstreamer,jpxiong/gstreamer,shelsonjava/gstreamer,surround-io/gstreamer,ensonic/gstreamer,cfoch/gstreamer,centricular/gstreamer,centricular/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,krichter722/gstreamer,mrchapp/gstreamer,collects/gstreamer,jpakkane/gstreamer,lovebug356/gstreamer,justinjoy/gstreamer,drothlis/gstreamer,lubosz/gstreamer,drothlis/gstreamer,StreamUtils/gstreamer,ylatuya/gstreamer,ylatuya/gstreamer,mparis/gstreamer,drothlis/gstreamer,lubosz/gstreamer,jpxiong/gstreamer,ahmedammar/platform_external_gst_gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,Distrotech/gstreamer,krieger-od/gstreamer,mparis/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,Distrotech/gstreamer,jpxiong/gstreamer,centricular/gstreamer,mrchapp/gstreamer,ensonic/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,ylatuya/gstreamer,StreamUtils/gstreamer,Lachann/gstreamer,surround-io/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,drothlis/gstreamer,Lachann/gstreamer,cfoch/gstreamer,magcius/gstreamer,ahmedammar/platform_external_gst_gstreamer,lovebug356/gstreamer,krieger-od/gstreamer,Lachann/gstreamer,collects/gstreamer,mparis/gstreamer,justinjoy/gstreamer,krichter722/gstreamer,justinjoy/gstreamer,Lachann/gstreamer,lovebug356/gstreamer,collects/gstreamer,drothlis/gstreamer,centricular/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,krichter722/gstreamer,cfoch/gstreamer,mrchapp/gstreamer,magcius/gstreamer,ahmedammar/platform_external_gst_gstreamer,collects/gstreamer,collects/gstreamer,krichter722/gstreamer,magcius/gstreamer,jpxiong/gstreamer,lovebug356/gstreamer,jpxiong/gstreamer,ylatuya/gstreamer,shelsonjava/gstreamer,cfoch/gstreamer,cablelabs/gstreamer,mparis/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,cablelabs/gstreamer,ensonic/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,ensonic/gstreamer