[cmake-developers] Add command line options for deprecation message control

[Michael Scott]

Hi Brad,

Here are a couple of patches for adding in support for controlling the 
suppression of deprecated warning messages, in the cmake-gui. Let me 
know if there's any issues with the changes.

The first patch adds a new dialog window to control the suppression of 
developer and deprecated warning messages, the old single checkbox in 
the options menu is then replaced by this dialog. The dialog window uses 
the get/set suppression methods in the cmake class, which is based on 
the state of the cache, so I believe this should fulfil the intention 
that the options are loaded from the current state of the cache.

The second patch just removes some duplicate code for setting the cache 
variables for the suppression of warning messages.

Cheers,
Michael
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