project: Improve Swift 4 compliance
This commit adapts the code to Swift 4 syntax in order to
to lower the amount of XCode warnings.
It also adapts the RxSwift syntaxt to the last version.
Change-Id: I63b1bcae5115c1a7641172ad2c39e7622ac436a4
Reviewed-by:
Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>
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