MOBILE-900: Delete FileReader custom implementation
MOBILE-900: Delete FileReader custom implementation

vmoll/moodlemobile,ingoscarmorenoc/ios2,techguru123/MoodM,Namikase/moodlemobile,GG001/GG,bakasa/moodle101,muhammadumarpatel/felarc,dianjiaotong/moodle_apps_android,clopezlga/moodlemobile,ingoscarmorenoc/ios7,ingoscarmorenoc/ios5,ingoscarmorenoc/ios6,vincent-nephila/amaumobile,danielsonnora/universidaderaffinato,guozhenqiang/hit,dianjiaotong/moodle_apps_android,danielsonnora/universidaderaffinato,muhammadumarpatel/felarc,ingoscarmorenoc/ios4,ingoscarmorenoc/ios6,iharris78/ctcswlapp,tang7526/moodlemobile,Vedran91/moodlemobile,elvincasem/moodlemobileous,ingoscarmorenoc/ios2,Namikase/moodlemobile,navdeep300/moodlemobile,stefobark/moodlemobile,xrdcode/moodlemobile,CEDITE/FACETVirtual.Mobile-OLD,moodlehq/moodlemobile,moodlehq/moodlemobile,vincent-nephila/amaumobile,ingoscarmorenoc/ios3,4r1y4n/moodlemobile,navdeep300/moodlemobile,Vedran91/moodlemobile,moodlewebexapp/moodlemobile,oustaban/moodlemobile,ingeniuslearning/moodlemobile,ingeniuslearning/moodlemobile,taher552/tahfiz,guozhenqiang/hit,elvincasem/moodlemobileous,stefobark/moodlemobile,GG001/GG,vmoll/moodlemobile,clopezlga/moodlemobile,dianjiaotong/dianjiaotong_apps_android,sergiopro14/moodlemobile,ingoscarmorenoc/ios3,oustaban/moodlemobile,ingoscarmorenoc/ios7,ardock/moodlemobile,dianjiaotong/dianjiaotong_apps_android,tang7526/moodlemobile,sergiopro14/moodlemobile,iharris78/ctcswlapp,ingoscarmorenoc/ios5,ingoscarmorenoc/ios4,taher552/tahfiz,sudeepnayak/moodlemobile,Ilmawankh/modle-elearning,Nithis111/AIT-Tech,Nithis111/AIT-Tech,CEDITE/FACETVirtual.Mobile-OLD,moodlewebexapp/moodlemobile,techguru123/MoodM,xrdcode/moodlemobile,ardock/moodlemobile,sudeepnayak/moodlemobile,ubaldojmp/Moodle-CUC,bakasa/moodle101,ubaldojmp/Moodle-CUC,Ilmawankh/modle-elearning,4r1y4n/moodlemobile