* Added ability to specify overwrite behaviour when downloading media
* Added helper for redownloading media items
* renamed media redownload worker to disambiguate it from similarly named methods
* Added new redownload option to source actions dropdown
* Refactored MediaQuery to use a __using__ macro
* docs
* Updated downloader and runner to handle sponsorblock failures more gracefully
* stopped download worker from running if a media item is preventing download
* [WIP] break out a few contexts, start refactoring fast index modules
* [WIP] more contexts, this time around slow indexing and downloads
* [WIP] got all tests passing
* [WIP] Added moduledocs
* Built a genserver to rename old jobs on boot
* Added a module naming check; moved things around
* Fixed specs
Kieran