Gallery-dl

- Added support for:
- `smugmug` - https://www.smugmug.com/
- Added title information for `mangadex` chapters
- Improved the `pinterest` API implementation ([83](https://github.com/mikf/gallery-dl/issues/83))
- Improved error handling for `deviantart` and `tumblr`
- Removed `gomanga` and `puremashiro`

- Added support for custom OAuth2 credentials for `pinterest`
- Improved rate limit handling for `tumblr` extractors
- Improved `hentaifoundry` extractors
- Improved `imgur` URL patterns
- Fixed miscellaneous extraction issues for `luscious` and `komikcast`
- Removed `loveisover` and `spectrumnexus`

- Added extractors for
- `nhentai` search results
- `exhentai` search results and favorites
- `nijie` doujins and favorites
- Improved metadata extraction for `exhentai` and `nijie`
- Improved `tumblr` extractors by avoiding unnecessary API calls
- Fixed Cloudflare DDoS protection bypass
- Fixed errors when trying to print unencodable characters

- Added extractors for `artstation` albums, challenges and search results
- Improved URL and metadata extraction for `hitomi`and `nhentai`
- Fixed page transitions for `danbooru` API results ([82](https://github.com/mikf/gallery-dl/issues/82))

- Added support for:
- `mangadex` - https://mangadex.org/
- `artstation` - https://www.artstation.com/
- Added Cloudflare DDoS protection bypass to `komikcast` extractors
- Changed archive ID formats for `deviantart` folders and collections
- Improved error handling for `deviantart` API calls
- Removed `imgchili` and various smaller image hosts

- Added `--proxy` to explicitly specify a proxy server ([76](https://github.com/mikf/gallery-dl/issues/76))
- Added options to customize [archive ID formats](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractorarchive-format) and [undefined replacement fields](https://github.com/mikf/gallery-dl/blob/master/docs/configuration.rst#extractorkeywords-default)
- Changed various archive ID formats to improve their behavior for favorites / bookmarks / etc.
- Affected modules are `deviantart`, `flickr`, `tumblr`, `pixiv` and all …boorus
- Improved `sankaku` and `idolcomplex` support by
- respecting `page` and `next` URL parameters ([79](https://github.com/mikf/gallery-dl/issues/79))
- bypassing the page-limit for unauthenticated users
- Improved `directlink` metadata by properly unquoting it
- Fixed `pixiv` ugoira extraction ([78](https://github.com/mikf/gallery-dl/issues/78))
- Fixed miscellaneous extraction issues for `mangastream` and `tumblr`
- Removed `yeet`, `chronos`, `coreimg`, `hosturimage`, `imageontime`, `img4ever`, `imgmaid`, `imgupload`