Ignore generated files and use swiftlint only in debugging
configuration.

Change-Id: I356afd1e55923ed1b907dfa1f10212e2b6afa5e9
Reviewed-by: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>

This commit:
- adapts code to a more Swifty way of coding
- uses previously added frameworks to make the code "type safer"

Change-Id: I5332e2843e82cac4f4f9af79714993863ef5963d

This commit:
- adds swiftlint analysis as custom build phase
- to install, see: https://github.com/realm/SwiftLint
- fix almost every error/warning messages detected by swiftlint

Change-Id: I0d15cecaa33c4f79dcd1417a2169f1e66fd2e551