Make Settings UI look like the iOS system default

[treh]

By using system standard controls it's possible to achieve a style that's more compliant with the rest of iOS and thus more familiar to the users. At the same time we reduce code size.

For comparision the old look:

[treh]

Do you prefer a merge or rebase to resolve the conflicts?

[treh]

added a fix to silence runtime warning in the same view

[ckrey]

Thanks