Fix handling of the OBJECTDESCRIPTOR clipboard (pasteboard) type on iOS

This should fix https://github.com/CollaboraOnline/online/issues/849

This is based on the corresponding fix for macOS. Much of our
clipboard code for iOS is based on that for macOS.

We need the pasteboard to have the OBJECTDESCRIPTOR type as a MIME
type that includes the typename attribute, because the code in sc
checks for that when it decides whether it is a proper
OBJECTDESCRIPTOR.

Simplify the data in the flavorMap array. No need to duplicate the
same MIME type string as both the pasteboard type and MIME type, for
those cases where the MIME type is used diretly as pasteboard type. We
also know that for those types, the MIME type might have additional
parameters, so be more lenient in checking.

With this change, and my recent change to sot, this now works:

Start the Collabora Office app. Open a spreadsheet. Select a cell
range. (It can include formulas.) Copy. Close the spreadsheet
document.

(Killing the app process is not necessary, as no in-process
clipboard is kept on iOS, but to make sure you are really accessing
the system pasteboard and not some in-process cache, feel free to kill
the process. After that, start Collabora Office again.)

Open a spreadsheet. Paste. You get the very same cells that you pasted
as such (with relative cell addresses in formulas properly adjusted,
as expected).

Previously, it would paste an image of the copied cell range, which is
fairly pointless.

There is still lots of opportunity for cleanup in the clipboard code
for macOS and iOS.

Change-Id: I4a385d52bbaafcd2ab8cb18e8f613c5efa592d11
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/109368
Tested-by: Tor Lillqvist <tml@collabora.com>
Reviewed-by: Tor Lillqvist <tml@collabora.com>

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