app_macro: Remove deprecated module.

For most modules that interacted with app_macro, this change is limited
to no longer looking for the current context from the macrocontext when
set.  Additionally, the following modules are impacted:

app_dial - no longer supports M^ connected/redirecting macro
app_minivm - samples written using macro will no longer work.
The sample needs a re-write

app_queue - can no longer a macro on the called party's channel.
Use gosub which is currently supported

ccss - no callback macro, gosub only

app_voicemail - no macro support

channel  - remove macrocontext and priority, no connected line or
redirection macro options
options - stdexten is deprecated to gosub as the default and only
pbx - removed macrolock
pbx_dundi - no longer look for macro

snmp - removed macro context, exten, and priority

ASTERISK-30304

Change-Id: I830daab293117179b8d61bd4df0d971a1b3d07f6

configs/samples/features.conf.sample

@@ -95,8 +95,8 @@
 ;   by the PBX core. In this case, these applications are executed outside of the
 ;   PBX core, so it does *not* make sense to use any application which has any
 ;   concept of dialplan flow. Examples of this would be things like Goto,
-;   Background, WaitExten, and many more.  The exceptions to this are Gosub and
-;   Macro routines which must complete for the call to continue.
+;   Background, WaitExten, and many more.  The exceptions to this are Gosub
+;   routines which must complete for the call to continue.
 ;
 ; Enabling these features means that the PBX needs to stay in the media flow and
 ; media will not be re-directed if DTMF is sent in the media stream.