dot-dump: terminate truncated strings and escape special chars
dot-dump: terminate truncated strings and escape special chars

Fixes syntax errors in generated dot files for caps with strings.

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