Medium improvements

Async download list + improved status and logging output

FreeBooks-v02.zip

A little polish!

• ADDED logging for books intended to download but failed along the way. This will show up as "errors.log" and will be in the same directory as the executable.
• FIXED out of bounds error when finished downloading books
• minor improvements all over

FreeBooksv1.1.zip

First release

Release-1.zip