Update Asterisk's CDRs for the new bridging framework

This patch is the initial push to update Asterisk's CDR engine for the new
bridging framework. This patch guts the existing CDR engine and builds the new
on top of messages coming across Stasis. As changes in channel state and bridge
state are detected, CDRs are built and dispatched accordingly. This
fundamentally changes CDRs in a few ways.
(1) CDRs are now *very* reflective of the actual state of channels and bridges.
    This means CDRs track well with what an actual channel is doing - which
    is useful in transfer scenarios (which were previously difficult to pin
    down). It does, however, mean that CDRs cannot be 'fooled'. Previous
    behavior in Asterisk allowed for CDR applications, channels, and other
    properties to be spoofed in parts of the code - this no longer works.
(2) CDRs have defined behavior in multi-party scenarios. This behavior will not
    be what everyone wants, but it is a defined behavior and as such, it is
    predictable.
(3) The CDR manipulation functions and applications have been overhauled. Major
    changes have been made to ResetCDR and ForkCDR in particular. Many of the
    options for these two applications no longer made any sense with the new
    framework and the (slightly) more immutable nature of CDRs.

There are a plethora of other changes. For a full description of CDR behavior,
see the CDR specification on the Asterisk wiki.

(closes issue ASTERISK-21196)

Review: https://reviewboard.asterisk.org/r/2486/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@391947 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/time.h

@@ -151,6 +151,17 @@ struct timeval ast_tvadd(struct timeval a, struct timeval b);
  */
 struct timeval ast_tvsub(struct timeval a, struct timeval b);
 
+/*!
+ * \since 12
+ * \brief Formats a duration into HH:MM:SS
+ *
+ * \param duration The time (in seconds) to format
+ * \param buf A buffer to hold the formatted string'
+ * \param length The size of the buffer
+ */
+void ast_format_duration_hh_mm_ss(int duration, char *buf, size_t length);
+
+
 /*!
  * \brief Calculate remaining milliseconds given a starting timestamp
  * and upper bound