Xcode 9 + Swift 4 Migration

[nerdsupremacist]

We will need to think about migrating to Xcode 9 and Swift 4 pretty soon.

Big questions:

• Which deps will we have to update ourselves?
• Which should run in Swift 4 and which in the 3.2 compatibility mode?
• How can we guide the pod script that creates the targets to configure the correct build settings for these projects and not bump them all blindly to Swift 4?

[tgymnich]

I think we can get rid of:

• PZPullToRefresh (not only code outdated also ui design)
• FoldingCell (replace with apple news like design)

[lukaskollmer]

We'll need to update SWXMLHash to 4.0.0 to get around this issue

/Users/lukas/Developer/iOS/Pods/SWXMLHash.XMLIndexer:72:22: Invalid redeclaration of 'Element'

(Swift 4 added associatedtype Element to Sequence which clashes with an enum case in SWXMLHash)

[tgymnich]

@mathiasquintero this can be closed right?

[nerdsupremacist]

Oh yeah this can be closed