[FacebookBridge] Add option to hide posts with facebook videos
[FacebookBridge] Add option to hide posts with facebook videos

This adds a new option 'novideo' that can be set to 'on' or 'off'
in order to skip posts that include facebook videos (does not work
for linked videos like YouTube). This option is 'off' by default.

References #533

RSS-Bridge/rss-bridge,Frenzie/rss-bridge,Riduidel/rss-bridge,ORelio/rss-bridge,teromene/rss-bridge,Riduidel/rss-bridge,kranack/rss-bridge,RSS-Bridge/rss-bridge,LogMANOriginal/rss-bridge,kranack/rss-bridge,LogMANOriginal/rss-bridge,Riduidel/rss-bridge,teromene/rss-bridge,ORelio/rss-bridge,kranack/rss-bridge,simonbru/rss-bridge,ORelio/rss-bridge,simonbru/rss-bridge,Frenzie/rss-bridge,RSS-Bridge/rss-bridge,kranack/rss-bridge,GregThib/rss-bridge,sebsauvage/rss-bridge