Dbg:Add CallableTracer for callables post()ed to boost.asio

This class and its macro allow us to trace the invocation of
callbacks as they're invoked by Boost.asio.

smocore/opts.cpp

@@ -43,6 +43,9 @@ struct option OptionParser::longOptions[] = {
     {"apipath", required_argument, 0, 'p'},
     {"libpath", required_argument, 0, 'p'},
     {"verbose", no_argument, 0, 'v'},
+    {"trace-callables", no_argument, 0, 't'},
+    {"call-trace", no_argument, 0, 't'},
+    {"calltrace", no_argument, 0, 't'},
     {"help", no_argument, 0, 'h'},
     {0, 0, 0, 0}
 };
@@ -58,7 +61,7 @@ void OptionParser::parseArguments(int argc, char *argv[], char **envp)
     optind = 1; // Reset optind to 1 before parsing
     opterr = 0;
     while ((opt = getopt_long(
-        argc, argv, "s:d:a:p:vh?", longOptions, &optionIndex)) != -1)
+        argc, argv, "s:d:a:p:vht?", longOptions, &optionIndex)) != -1)
     {
         switch (opt)
         {
@@ -91,6 +94,9 @@ void OptionParser::parseArguments(int argc, char *argv[], char **envp)
         case 'v':
             verbose = true;
             break;
+        case 't':
+            traceCallables = true;
+            break;
         case 'h':
             throw JustPrintUsageNoError(*this);
         case '?':
@@ -108,6 +114,7 @@ std::string OptionParser::getUsage() const
            "[-a|--api-lib|--apilib|--api|--lib <filename>] "
            "[-p|--api-lib-path|--apipath|--libpath <directory>] "
            "[-v|--verbose] "
+           "[-t|--trace-callables|--call-trace|--calltrace] "
            "[-h|--help]\n\n"
            "Example DAP spec:\n"
            "  -s '+edev|my-cam|video-qualeiface|v4l2-video(fps-hz=30)|v4l2()|/dev/video0'";
@@ -121,6 +128,10 @@ std::string OptionParser::stringifyOptions(void) const
         oss << "Verbose mode is on" << std::endl;
     }
 
+    if (traceCallables) {
+        oss << "Callable tracing is enabled" << std::endl;
+    }
+
     oss << "Cmdline DAP Specs: " << dapSpecs << std::endl;
 
     oss << "DAP Spec Files: ";