Remove old style of search bar, replace with iOS default style

[michalrentka]

Fixes #764

[michalrentka]

@dstillman can we move to current iOS defaul style of search bar? The current implementation is a bit hacky and had some issues, which seem to have been fixed by OS over time (or at least I didn't see any reports for some time). Anyway the current default is very similar and also works a bit smoother.

[michalrentka]

@dstillman do these icons in order look better or do we maybe want to try compressing search bar into search icon in portrait?

[dstillman]

That's better. If we can, is there any reason not to collapse to search icon in all modes? I guess bigger tap target, clearer differentiation between the two search icons with the placeholder text, Files doesn't do it, and just sort of weird to have two identical icons if we can help it…

[michalrentka]

That's better. If we can, is there any reason not to collapse to search icon in all modes? I guess bigger tap target, clearer differentiation between the two search icons with the placeholder text, Files doesn't do it, and just sort of weird to have two identical icons if we can help it…

We definitely don't have to collapse, it's optional (and possibly a bit more work, since it's not default behavior). I just mentioned it as a space saving method. Most apps with the search bar visible probably just keep it visible at all times.

[dstillman]

Yeah, I just meant it seems a little silly to display the search box all the time, but not having two identical icons may be reason enough to keep it. So I guess until we need the room, we can leave it.