Add QOA (Quite OK Audio) as a WAV compression mode

doc/classes/AudioStreamWAV.xml

@@ -15,7 +15,7 @@
 			<return type="int" enum="Error" />
 			<param index="0" name="path" type="String" />
 			<description>
-				Saves the AudioStreamWAV as a WAV file to [param path]. Samples with IMA ADPCM format can't be saved.
+				Saves the AudioStreamWAV as a WAV file to [param path]. Samples with IMA ADPCM or QOA formats can't be saved.
 				[b]Note:[/b] A [code].wav[/code] extension is automatically appended to [param path] if it is missing.
 			</description>
 		</method>
@@ -56,6 +56,9 @@
 		<constant name="FORMAT_IMA_ADPCM" value="2" enum="Format">
 			Audio is compressed using IMA ADPCM.
 		</constant>
+		<constant name="FORMAT_QOA" value="3" enum="Format">
+			Audio is compressed as QOA ([url=https://qoaformat.org/]Quite OK Audio[/url]).
+		</constant>
 		<constant name="LOOP_DISABLED" value="0" enum="LoopMode">
 			Audio does not loop.
 		</constant>

doc/classes/ResourceImporterWAV.xml

@@ -14,6 +14,7 @@
 			The compression mode to use on import.
 			[b]Disabled:[/b] Imports audio data without any compression. This results in the highest possible quality.
 			[b]RAM (Ima-ADPCM):[/b] Performs fast lossy compression on import. Low CPU cost, but quality is noticeably decreased compared to Ogg Vorbis or even MP3.
+			[b]QOA ([url=https://qoaformat.org/]Quite OK Audio[/url]):[/b] Performs lossy compression on import. CPU cost is slightly higher than IMA-ADPCM, but quality is much higher.
 		</member>
 		<member name="edit/loop_begin" type="int" setter="" getter="" default="0">
 			The begin loop point to use when [member edit/loop_mode] is [b]Forward[/b], [b]Ping-Pong[/b] or [b]Backward[/b]. This is set in seconds after the beginning of the audio file.