- Moving forward declarations to one block

- Moving global variables to one block
- Moving global networking variables to one block
- Small whitespace changes
- Renaming a few more global channel settings to global_ for clarity
(No functional changes)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8825 65c4cc65-6c06-0410-ace0-fbb531ad65f3