Repository restructuring

[karussell]

We need the "ready-to-use" translated sources in one repository, with the following advantages:

• The iOS repo will be lightweight and easy to include in your own project
• No more build problems
• Simpler documentation on how to get started
• Will hopefully enhance adoption and contributions

Ideas from @clns

[karussell]

I've created https://github.com/graphhopper/graphhopper-ios-build to move the converter and examples there. And also added you @clns