v2.0.2: Bug fixes

Numerous small stability, security and quality-of-life fixes.

Changelog

1. Fix several deadlocks as a result of erroneous download lock copying
2. Greatly improve download performance using r/w mutexes
3. Fix screen redraw bind. Previously had no effect. Now orders complete clear and redraw
4. Show custom message when waiting for YouTube to re-encode video, rather than just "In progress" at 100%
5. Remove several redundant usage of goroutines from legacy code. Improves performance
6. Bunp Go version go 1.18 (mainly to use generics)
7. Refactor out list calls to central embedded struct
8. As a result of the above, fixed several small visual bugs involving scroll handling
9. Fix incorrect underscroll calculation, causing visual mismatch and occasional crashes
10. Fix crash when dequeueing waited download when queue has more than one download ongoing
11. Outright prevent most cases of crashes with dequeueing (for some reason these bugs keep cropping up - hopefully not any more)
12. Fix screen flickering when scrolling through table component