sw/source/core/doc: Stop abusing observer pattern for code obfuscation.

The old SwClient/SwModify combo is a questionable implementation of the
observer pattern (among other things). The one thing the observer
pattern is good for is dependency inversion: The creator of the message
does not need to know the type of the receiver. Calling the message
handling on the receiver directly introduces tight coupling and entirely
defeats the purpose, leaving us with the worst of both worlds.

In such case, at least be honest about the tight coupling and call a
somewhat more explicit member function of the target.

Thus introduce SwFootNoteInfo::UpdateFormatOrAttr,
SwContentNode::UpdateAttr, remove some useless SwFormatChg clutter in
Set{Foot,End}NodeInfo, and check for some invariants in
SwContentNode::SwClientNotify to limit some of the "a message are two
void pointers" madness.

Change-Id: I32a8d6973231bb5f65c9e144be72d5bcf98f3f44
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/105104
Tested-by: Jenkins
Reviewed-by: Bjoern Michaelsen <bjoern.michaelsen@libreoffice.org>

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