* Add file.data.relativePath to the file.id
* Don’t add/overwrite a file if a file with the same id already exsists, issue a warning
* override @uppy/tus fingerprint to uppy’s file.id
* combine cordove/react native handling, don’t log twice
* always use onError for errors in addFile
* use file.meta.relativePath instead of file.data.relativePath
what do you think, @lakesare?
* update tests to include allowing/diallowing duplicates and file.id generation with relativePath
* update tus-js-client
* refactor error handling for addFile and upload into a mutual _showOrLogErrorAndThrow method
* explain duplicate files and relativePath
* throw TypeError vs Error when allowedFileTypes is not an array
* fix tests
* tweak docs
* Emit restriction-failed for all restriction errors, move it to _showOrLogErrorAndThrow
* core: add test for ID generation with non-latin names
* core: adjust ID generation to keep non-latin characters
This shouldn't be bc-breaking!
Now, non-latin characters are encoded as their charcode in base 32, so
files that only differ by name in a non-latin language will generate
different IDs.
