OneDriveFileProvider has outdate OneDrive API support

[evilutioner]

OneDriveFileProvider currently doesn't work. The default API entry base url https://api.onedrive.com/ response error "bad request". OneDriveHelper.swift has issues with url parsing. New OneDrive API operates with 'root:' instead of 'root'

[amosavian]

Please check latest commit @evilutioner

[evilutioner]

It doesn't work, this api cannot load root folder at least. I discovered additional issues:

1. multiple percent encoding for path folder with spaces changed this " " to %25%25%25%20. Percent encoding operation should be only once per path string.
2. IOS API - URL(string: rpath, relativeTo: driveURL) returns nil with base url if it contains symbol ":" in path (in onedrive case "root:")

[evilutioner]

Created pull request: #57

[amosavian]

Fixed by pull request #57