Rewrite extract_item and extract_items functions

This commit completely rewrites the extract_item and extract_items
function. Before this commit these two function were an unreadable
mess. The extract_item function was a lengthy if-elsif chain
while the extract_items function contained an incomprehensible
mess of .try, else and ||.

With this commit both of these functions have been pulled into a
separate file with the internal logic being moved to a few classes.

This significantly reduces the size of these two methods, enhances
readability and makes adding new extraction/parse rules much simpler.

See diff for details.

--
This cherry-picked commit also removes the code for parsing featured
channels present on the original.

(cherry picked from commit a027fbf7af1f96dc26fe5a610525ae52bcc40c28)

0 files changed, 0 insertions, 0 deletions