Make codec level configurable for AMD GPUs

[pasarn]

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Feature Request

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Some Moonlight client devices like LG TVs have problems with the codec level that AMD AMF use by default.
AMD use the highest posible level. (6.2 with HEVC)

The level is configurable by the level paramter. I test it in an fork and my LG TV can use the stream.

{
// Common options
{
{"filler_data"s, false},
{"forced_idr"s, 1},
{"latency"s, 1},
{"skip_frame"s, 0},
{"log_to_dbg"s, {
return config::sunshine.min_log_level < 2 ? 1 : 0;
}},
{"gops_per_idr"s, 1},
{"header_insertion_mode"s, "idr"s},
{"level"s, "5.2"s}, // Change I made
{"preencode"s, &config::video.amd.amd_preanalysis},
{"quality"s, &config::video.amd.amd_quality_hevc},
{"rc"s, &config::video.amd.amd_rc_hevc},
{"usage"s, &config::video.amd.amd_usage_hevc},
{"vbaq"s, &config::video.amd.amd_vbaq},
{"enforce_hrd"s, &config::video.amd.amd_enforce_hrd},
},
{}, // SDR-specific options
{}, // HDR-specific options
{}, // YUV444 SDR-specific options
{}, // YUV444 HDR-specific options
{}, // Fallback options
"hevc_amf"s,
},

It would be great if we could set the level via the website.

Unfortunately my C++ skills are not good enough to create a pull request.

[pasarn]

It would fix this problem:
mariotaku/moonlight-tv#355