[RFA][objc] Identifier cleanup

[David Ayers]

Hello,

This is another pure mechanical cleanup of objc-act & co.  All it does 
is make some identifier names of a certain class follow a common naming 
conventions hopefully making the source easier to read.  I've also 
slipped in some minor documentation (and a C mode sequence 
objc-tree-def).  I was told the the ChangeLog should mention all changes 
so it's a bit verbose.

Bootstrapped and tested on i686-pc-linux-gnu.

Please apply if approved.

Cheers,
David Ayers

PS: Next up... hopefully the removal of the 'id' keyword...
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