Presets: Add MKV (h.264) sw/hw presets (OpenShot#4637)

- Clone every `format_mp4_x64*.xml` preset into an equivalent
  `format_mkv_x264*.xml` preset, with only the title and
  container format changed.

src/presets/format_mkv_x264.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE openshot-export-option>
+<export-option>
+	<type translatable="True">All Formats</type>
+	<title translatable="True">MKV (h.264)</title>
+	<videoformat>mkv</videoformat>
+	<videocodec>libx264</videocodec>
+	<audiocodec>aac</audiocodec>
+	<audiochannels>2</audiochannels>
+	<audiochannellayout>3</audiochannellayout>
+	<videobitrate
+	 low="384 kb/s"
+	 med="5 Mb/s"
+	 high="15.00 Mb/s"></videobitrate>
+	<audiobitrate
+	 low="96 kb/s"
+	 med="128 kb/s"
+	 high="192 kb/s"></audiobitrate>
+	<samplerate>48000</samplerate>
+</export-option>

src/presets/format_mkv_x264_dx.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE openshot-export-option>
+<export-option>
+	<type translatable="True">All Formats</type>
+	<title translatable="True">MKV (h.264 dx)</title>
+	<videoformat>mkv</videoformat>
+	<videocodec>h264_dxva2</videocodec>
+	<audiocodec>aac</audiocodec>
+	<audiochannels>2</audiochannels>
+	<audiochannellayout>3</audiochannellayout>
+	<videobitrate
+	 low="384 kb/s"
+	 med="5 Mb/s"
+	 high="15.00 Mb/s"></videobitrate>
+	<audiobitrate
+	 low="96 kb/s"
+	 med="128 kb/s"
+	 high="192 kb/s"></audiobitrate>
+	<samplerate>48000</samplerate>
+</export-option>

src/presets/format_mkv_x264_hw.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE openshot-export-option>
+<export-option>
+	<type translatable="True">All Formats</type>
+	<title translatable="True">MP4 (h.264 va)</title>
+	<videoformat>mkv</videoformat>
+	<videocodec>h264_vaapi</videocodec>
+	<audiocodec>aac</audiocodec>
+	<audiochannels>2</audiochannels>
+	<audiochannellayout>3</audiochannellayout>
+	<videobitrate
+	 low="384 kb/s"
+	 med="5 Mb/s"
+	 high="15.00 Mb/s"></videobitrate>
+	<audiobitrate
+	 low="96 kb/s"
+	 med="128 kb/s"
+	 high="192 kb/s"></audiobitrate>
+	<samplerate>48000</samplerate>
+</export-option>

src/presets/format_mkv_x264_nv.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE openshot-export-option>
+<export-option>
+	<type translatable="True">All Formats</type>
+	<title translatable="True">MKV (h.264 nv)</title>
+	<videoformat>mkv</videoformat>
+	<videocodec>h264_nvenc</videocodec>
+	<audiocodec>aac</audiocodec>
+	<audiochannels>2</audiochannels>
+	<audiochannellayout>3</audiochannellayout>
+	<videobitrate
+	 low="384 kb/s"
+	 med="5 Mb/s"
+	 high="15.00 Mb/s"></videobitrate>
+	<audiobitrate
+	 low="96 kb/s"
+	 med="128 kb/s"
+	 high="192 kb/s"></audiobitrate>
+	<samplerate>48000</samplerate>
+</export-option>

src/presets/format_mkv_x264_qsv.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE openshot-export-option>
+<export-option>
+	<type translatable="True">All Formats</type>
+	<title translatable="True">MKV (h.264 qsv)</title>
+	<videoformat>mkv</videoformat>
+	<videocodec>h264_qsv</videocodec>
+	<audiocodec>aac</audiocodec>
+	<audiochannels>2</audiochannels>
+	<audiochannellayout>3</audiochannellayout>
+	<videobitrate
+	 low="384 kb/s"
+	 med="5 Mb/s"
+	 high="15.00 Mb/s"></videobitrate>
+	<audiobitrate
+	 low="96 kb/s"
+	 med="128 kb/s"
+	 high="192 kb/s"></audiobitrate>
+	<samplerate>48000</samplerate>
+</export-option>

src/presets/format_mkv_x264_vtb.xml

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE openshot-export-option>
+<export-option>
+	<type translatable="True">All Formats</type>
+	<title translatable="True">MKV (h.264 videotoolbox)</title>
+	<videoformat>mkv</videoformat>
+	<videocodec>h264_videotoolbox</videocodec>
+	<audiocodec>aac</audiocodec>
+	<audiochannels>2</audiochannels>
+	<audiochannellayout>3</audiochannellayout>
+	<videobitrate
+	 low="384 kb/s"
+	 med="5 Mb/s"
+	 high="15.00 Mb/s"></videobitrate>
+	<audiobitrate
+	 low="96 kb/s"
+	 med="128 kb/s"
+	 high="192 kb/s"></audiobitrate>
+	<samplerate>48000</samplerate>
+</export-option>