Updated refresh time in FeedReader service

Changed from 45 minutes to a full day.

Signed-off-by: John Morton <john@johnfmorton.com>
Removed applicationExists checks

Previously removed via commented out blocks.
2nd attempt at updated refresh time.
Removed duplicate in validate data loop.
Updated to use Craft's native helpers JsonHelper and IOHelper libraries

Signed-off-by: John Morton <john@johnfmorton.com>