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.h

@@ -44,6 +44,7 @@ struct server {
 
 struct server_params {
     const char *crop;
+    const char *codec_options;
     struct port_range port_range;
     uint16_t max_size;
     uint32_t bit_rate;