Const-ify the world (or at least a good part of it)

This patch adds 'const' tags to a number of Asterisk APIs where they are appropriate (where the API already demanded that the function argument not be modified, but the compiler was not informed of that fact). The list includes:

- CLI command handlers
- CLI command handler arguments
- AGI command handlers
- AGI command handler arguments
- Dialplan application handler arguments
- Speech engine API function arguments

In addition, various file-scope and function-scope constant arrays got 'const' and/or 'static' qualifiers where they were missing.

Review: https://reviewboard.asterisk.org/r/251/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196072 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_osplookup.c

@@ -1296,8 +1296,8 @@ static int osp_finish(
  * \return 0 Success, -1 Failed
  */
 static int ospauth_exec(
-	struct ast_channel* chan,
-	void* data)
+	struct ast_channel *chan,
+	const char *data)
 {
 	int res;
 	const char* provider = OSP_DEF_PROVIDER;
@@ -1377,7 +1377,7 @@ static int ospauth_exec(
  */
 static int osplookup_exec(
 	struct ast_channel* chan,
-	void* data)
+	const void* data)
 {
 	int res, cres;
 	const char* provider = OSP_DEF_PROVIDER;
@@ -1551,7 +1551,7 @@ static int osplookup_exec(
  */
 static int ospnext_exec(
 	struct ast_channel* chan,
-	void* data)
+	const void* data)
 {
 	int res;
 	const char* provider = OSP_DEF_PROVIDER;
@@ -1707,7 +1707,7 @@ static int ospnext_exec(
  */
 static int ospfinished_exec(
 	struct ast_channel* chan,
-	void* data)
+	const void* data)
 {
 	int res = 1;
 	int cause = 0;