Update CHANGES and UPGRADE.txt for 18.13.0

CHANGES

@@ -12,6 +12,49 @@
 ===
 ==============================================================================
 
+------------------------------------------------------------------------------
+--- Functionality changes from Asterisk 18.12.0 to Asterisk 18.13.0 ----------
+------------------------------------------------------------------------------
+
+app_confbridge
+------------------
+ * Adds the CONFBRIDGE_CHANNELS function which can
+   be used to retrieve a list of channels in a ConfBridge,
+   optionally filtered by a particular category. This
+   list can then be used with functions like SHIFT, POP,
+   UNSHIFT, etc.
+
+app_voicemail
+------------------
+ * The r option has been added, which prevents deletion
+   of messages from VoiceMailMain, which can be
+   useful for shared mailboxes.
+
+ari
+------------------
+ * Expose channel driver's unique id (which is the Call-ID for SIP/PJSIP)
+   to ARI channel resources as 'protocol_id'.
+
+   ASTERISK-30027
+
+res_agi
+------------------
+ * Agi command 'exec' can now be enabled
+   to evaluate dialplan functions and variables
+   by setting the variable AGIEXECFULL to yes.
+
+res_parking
+------------------
+ * An m option to Park and ParkAndAnnounce now allows
+   specifying a music on hold class override.
+
+stasis_channels
+------------------
+ * Expose channel driver's unique id (which is the Call-ID for SIP/PJSIP)
+   to ARI channel resources as 'protocol_id'.
+
+   ASTERISK-30027
+
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 18.11.3 to Asterisk 18.12.0 ----------
 ------------------------------------------------------------------------------

doc/CHANGES-staging/app_confbridge_channels.txt

@@ -1,7 +0,0 @@
-Subject: app_confbridge
-
-Adds the CONFBRIDGE_CHANNELS function which can
-be used to retrieve a list of channels in a ConfBridge,
-optionally filtered by a particular category. This
-list can then be used with functions like SHIFT, POP,
-UNSHIFT, etc.

doc/CHANGES-staging/app_voicemail_nodelete.txt

@@ -1,5 +0,0 @@
-Subject: app_voicemail
-
-The r option has been added, which prevents deletion
-of messages from VoiceMailMain, which can be
-useful for shared mailboxes.

doc/CHANGES-staging/ari_add_pvt_id_to_channel_resource.txt

@@ -1,7 +0,0 @@
-Subject: ari
-Subject: stasis_channels
-
-Expose channel driver's unique id (which is the Call-ID for SIP/PJSIP)
-to ARI channel resources as 'protocol_id'.
-
-ASTERISK-30027

doc/CHANGES-staging/res_agi.txt

@@ -1,5 +0,0 @@
-Subject: res_agi
-
-Agi command 'exec' can now be enabled
-to evaluate dialplan functions and variables
-by setting the variable AGIEXECFULL to yes.

doc/CHANGES-staging/res_parking_moh.txt

@@ -1,4 +0,0 @@
-Subject: res_parking
-
-An m option to Park and ParkAndAnnounce now allows
-specifying a music on hold class override.