* Introduced a _SetStringValue() to avoid code duplication.
* The string types now check the original value, and don't write anything if the
contents stay unchanged (with the current exception of the sniffer rules).
* The monitor notfication methods no longer "clobber" the status result.
* Major cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@16432 a95241bf-73f2-0310-859d-f6bbb57e9c96
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