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- Underlined shortcuts are triggered with Alt, like on Desktop
- Fileselector button texts change so that shortcuts are normal letters
- Arrow shortcuts specified separately to avoid need for
  SDL1 specific key event unicode field
- Separate field in structs for shortcut key

All current SDL GUI shortcuts will now hopefully work also with SDL2.

leave them for arrow shortcuts as those don't
have text which could specify the shortcut.

So that normal letters can be used to shortcut positions in file list...

The d_type member is not mandatory in the dirent struct and some OSes / toolchains
don't provide it (mingw for example)

This has annoyed me for a long time. With SDL GUI keyboard shortcuts
user is even less sure what he (e.g. accidentally) invoked, so it's
better to have it stated in fsel explicitly.

Thanks to Miguel for the list.

When using the fileselector in a large directory, then going to a small
directory with <= 16 entries, the scrollbar was drawn at the wrong position.

(this is a dirty fix, in that case the last files of a directory could still be difficult
to reach using the mouse)

Thanks to Teemu Hukkanen for the hint!

(when it's called directly from keyboard shortcut,
not from options dialog)

Removed : return to previous scrollbar look and feel
TODO: there's still a bug with the mouse grabbing, if you use the mousewheel before grabbing the scrollbar

Thanks to Christoph Fritz for the patch.

For the SDL GUI code, now also use 'true' and 'false' from stdbool.h instead of the obsolete defines.

* Handle existing path with non-existing file better. Earlier File
  selector moved to CWD in this case, now it keeps in the directory and
  just suggest the given filename.

  This doesn't change the normal Hatari behaviour as Hatari paths
  default to CWD, but it helps packages providing Hatari config files
  with pre-defined file save paths.

of just not showing the file select at all (user doesn't
understand it, especially as there's no warning/error about it).