Changes to manager events in channel.c

Changes to manager events in channel.c

- Newstate event
        - Now has "CalleridNum" for numeric caller id, like Newchannel
        - The event does not send "<unknown>" for unknown caller IDs just an empty field
- Newstate and Newchannel events
        - these have changed headers
        "State"         -> ChannelStateDesc     Text based channel state
                        -> ChannelState         Numeric channel state
        - The events does not send "<unknown>" for unknown caller IDs just an empty field

- Newstate event
        - Now has "CalleridNum" for numeric caller id, like Newchannel
        - The event does not send "<unknown>" for unknown caller IDs just an empty field

- Link and Unlink events
        - The "Link" and "Unlink" bridge events in channel.c are now renamed to "Bridge"
        - The link state is in the bridgestate: header as "Link" or "Unlink"
        - For channel.c bridges, "Bridgetype: core" is added. This opens up for
          bridge events in rtp.c and channel drivers

- The "Rename" manager event has a renamed header, to use the same
        terminology for the current channel as other events
        - Oldname       -> Channel

(Moremanager)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@91409 65c4cc65-6c06-0410-ace0-fbb531ad65f3