Version 3.1.0

Example:

• Add Background upload example.
• Add Cancel upload example.
• Add Upload Progress example.
• Add Pause/Resume Upload example.
• Add Document/Video conversion example

Widget:

• "UploadcareWidget.getInstance()" doesn't require Context no more.
• Background upload (using WorkManager internally).
• Full support for Android 11 (compile/target SDK 30).
• Update to full usage of MaterialComponents.
• Dark theme support.
• Refactor widget methods to be much easier to use, builder like pattern.
• Add ability to specify upload parameters like cancellation, show progress etc.
• Signed uploads for local Files.
• Update dependencies.
• Update documentation.

Library:

• Add Secure Delivery support (Authenticated Urls) from custom CDN (Akamai, KeyCDN).
• Add ability to Pause/Resume upload when using FileUploader/MultipleFilesUploader.
• Add ability to cancel upload in progress.
• Add ability to listen for upload progress for File/Url and Multiple Files/Urls.
• Add "UploadFileCallback", use it instead of "UploadcareFileCallback" for uploading file.
• Rename "privateKey" to "secretKey".
• Add ability to get File/Files with Object Recognition information.
• Signed uploads.
• Add support for API v0.6
• Add ability to Create file Group.
• Add ability to copy files in local/remote storage. Update old copy file method, mark as Deprecated.
• Add ability to get/create/update/delete Webhooks.
• Add ability to convert documents/videos.
• Update dependencies.
• Update documentation.

This closes #40 , closes #37 , closes #36 , closes #35 , closes #33 , closes #30 , closes #29 , closes #22 , closes #21 , closes #32 , closes #34