Modularize and change format of quickhits.txt

Describe the feature request: Similar to how Discovery/Web-Content/combined_words.txt and Discovery/Web-Content/combined_directories are composed of several other wordlists, it would be beneficial to modularize the quickhits.txt wordlist so it can contain automatically-updating components.

Using a different wordlist format should also be considered so that when the wordlist is used, it's easier to trace back which web service the matched URL path corresponds to.

Next steps: Proposals for what that new format should look like are welcome.