Add --codec-options

Add a command-line parameter to pass custom options to the device
encoder (as a comma-separated list of "key[:type]=value").

The list of possible codec options is available in the Android
documentation:
<https://d.android.com/reference/android/media/MediaFormat>

PR #1325 <https://github.com/Genymobile/scrcpy/pull/1325>
Refs #1226 <https://github.com/Genymobile/scrcpy/pull/1226>

Co-authored-by: Romain Vimont <rom@rom1v.com>

app/src/server.c

@@ -270,6 +270,7 @@ execute_server(struct server *server, const struct server_params *params) {
         display_id_string,
         params->show_touches ? "true" : "false",
         params->stay_awake ? "true" : "false",
+        params->codec_options ? params->codec_options : "-",
     };
 #ifdef SERVER_DEBUGGER
     LOGI("Server debugger waiting for a client on device port "