Index installed sounds and implement ARI sounds queries

This adds support for stasis/sounds and stasis/sounds/{ID} queries via
the Asterisk RESTful Interface (ARI, formerly Stasis-HTTP).

The following changes have been made to accomplish this:
* A modular indexer was created for local media.
* A new function to get an ast_format associated with a file extension
  was added.  
* Modifications were made to the built-in HTTP server so that URI
  decoding could be deferred to the URI handler when necessary.
* The Stasis-HTTP sounds JSON documentation was modified to handle
  cases where multiple languages are installed in different formats.
* Register and Unregister events for formats were added to the system
  topic.

(closes issue ASTERISK-21584)
(closes issue ASTERISK-21585)
Review: https://reviewboard.asterisk.org/r/2507/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@392700 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/asterisk.c

@@ -4396,6 +4396,11 @@ int main(int argc, char *argv[])
 		exit(1);
 	}
 
+	if (ast_sounds_index_init()) {
+		printf("%s", term_quit());
+		exit(1);
+	}
+
 	if ((moduleresult = load_modules(0))) {		/* Load modules */
 		printf("%s", term_quit());
 		exit(moduleresult == -2 ? 2 : 1);