Rclone import

[roleohibachi]

In support of #102, this implements:

• class wizardPage_rsync - an attempt at a functional QWizardPage. Never done this before, almost certainly needs attention. The rest of the GUI has not been modified to create a path to it (I don't know how).
• function import_rclone - handling of rclone-derived data, comments below.
• function parse_rclone_remote - tool for reading a remote configuration from an rclone config file. Fairly minimal since, unlike OD, the format is "correct" INI.

If an rclone onedrive remote is provided, a new config is created (largely reusing code from the "create config" page). The drive_id is taken from rclone. The refresh_token is also taken, since it belongs to the same user, and written to the refresh_token file. Information on the this rclone feature is here.

If an rclone alias remote is provided, it is split into the "real remote" (which should be a onedrive, and is used to populate the import function) and the path that was aliased. The path is then listed in the sync_list file, which will include only that path in sync. Information on this rclone feature is here. I feel there should be more error handling here, but I'm not sure what failure cases would look like.

Decision for maintainers: whether to use the rclone "remote_name" as the new profile's name, or whether to use the user-provided value.

Here is a sample rclone.conf (with realistic, but bogus, values). rclone.conf.txt