Add some trivialish first attempts at iOS-specific headers and some
source files that surely are quite bogus and does nothing sane, but
must start with something. Mostly based on the MacOSX ("aqua") code.

They are not included in the SDK either.

Header names are all lower-case. Use our own sehandler.hxx instead of
assuming that stuff being in a patches excpt.h.

This reverts commit 070016df3becc51d467fbf2e70312106d7392c89.
Thomas and I both submitted different fixes at about the same time.

This reverts parts of
82ea128f190dbe8d707cb140a5a2bb2b48bef58d
e1309004099d1a1c0a9bc1ba6de9e5054629da3c
which were a bit over-zealous at removing "unused" stuff. LGPLv3+/MPL

This reverts commit 817875a7126b403ab029ca1fa06c9d3297bd24b2.

- remove the correct SetUpdateMode()
- Clone() always returns NULL
- SetFont() doesn't do anything