[Lazarus] TComboBox.ReadOnly

[Juha Manninen]

Regarding issue:
 https://bugs.freepascal.org/view.php?id=36978

TComboBox ReadOnly was deprecated in r55243 by Ondrej at 2017-06-05.
No reason is mentioned but I believe it had good reasons.
The deprecated message was updated in r59467 by Mattias at 2018-11-06.

The deprecated message says: "use extended Style values instead."
How exactly should they be used to get the old ReadOnly behavior?

The deprecated message says the ReadOnly property will be removed in
Lazarus 2.2.
I removed it and fixed the numerous side effects. The changes are in the
attached patch.
There may be more side effects, I only tested with packages that happened
to be installed here.
Is it OK to apply?

Juha
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