Add Swift Package Manager support

[karimhm]

Related to #1149

The following PRs need to be merged first before being able to add a Package.swift manifest to XMPPFramework

• KissXML: #119
• libidn-framework: #6

[chrisballinger]

This is also blocked on Xcode 12 because XMPPFramework includes resources, which requires SPM 5.3. See SE-0271 for more details.

XMPPFramework/XMPPFramework.podspec

Line 37 in 9d625f5

ss.resources = [ 'Extensions/**/*.{xcdatamodel,xcdatamodeld}']

[karimhm]

This is also blocked on Xcode 12 because XMPPFramework includes resources, which requires SPM 5.3. See SE-0271 for more details.

XMPPFramework/XMPPFramework.podspec

Line 37 in 9d625f5

ss.resources = [ 'Extensions/**/*.{xcdatamodel,xcdatamodeld}']

We could add Swift PM support but let the user to copy all assets needed by XMPPFramework, until Xcode 12 rolls out to production.

[karimhm]

@chrisballinger I believe it is possible to use XMPPFramework without Core Data extensions (but nothing will persist).

[karimhm]

@chrisballinger is it ok to migrate the Core Data object model from xcdatamodel bundle to code?

[chrisballinger]

@karimhm It would probably be better to leave the model definitions as-is to avoid breaking changes if possible. Really appreciate your work on the SPM support, it's been on my mind for a while and you did an awesome job getting all the pieces in place.