File storage extension - invalid file name characters must be encoded

[djaglowski]

The invalid characters need to be encoded using valid ones. I guess something like urlencode/QueryEscape (https://golang.org/pkg/net/url/#QueryEscape) should work. You will need to check that it escape the correct set of characters (it needs to be a superset of what we need). I am not aware of a precise function that does this for path names.

Originally posted by @tigrannajaryan in #3087 (comment)

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[andrzej-stencel]

The https://golang.org/pkg/net/url/#QueryEscape function specifically is not a good fit, as it puts percent characters % in the output. The percent characters % have a special meaning in Windows, as environment variables - e.g. %PATH%.