Change all nested functions to member functions
Change all nested functions to member functions

This fixes error "Using $this when not in object context"

Nested functions are not part of the object and therefore don't have
access to the object instance $this!

kranack/rss-bridge,griffaurel/rss-bridge,sebsauvage/rss-bridge,ORelio/rss-bridge,ORelio/rss-bridge,LogMANOriginal/rss-bridge,RSS-Bridge/rss-bridge,kranack/rss-bridge,Frenzie/rss-bridge,simonbru/rss-bridge,Frenzie/rss-bridge,polo2ro/rss-bridge,GregThib/rss-bridge,Riduidel/rss-bridge,RSS-Bridge/rss-bridge,RSS-Bridge/rss-bridge,ORelio/rss-bridge,Riduidel/rss-bridge,mro/rss-bridge,simonbru/rss-bridge,LogMANOriginal/rss-bridge,mro/rss-bridge,kranack/rss-bridge,Riduidel/rss-bridge,kranack/rss-bridge,teromene/rss-bridge,teromene/rss-bridge