Example apps don't compress enough about libavif

[vi]

Quality range of 42 to 63 tends to give me exactly the same output file.

[vi]

Patch for enabling low-quality mode:

diff --git a/src/codec_aom.c b/src/codec_aom.c
index 019865c..22241a8 100644
--- a/src/codec_aom.c
+++ b/src/codec_aom.c
@@ -284,6 +284,7 @@ static avifBool encodeOBU(avifImage * image, avifBool alphaOnly, avifEncoder * e
         cfg.rc_max_quantizer = 0;
     } else {
         cfg.rc_max_quantizer = quality;
+        cfg.rc_min_quantizer = quality;
     }
 
     uint32_t encoderFlags = 0;

[joedrago]

I agree with this patch that both the min and max quantizers should be adjustable by the user of the library, so I've just exposed them directly (and abandoned the confusing term "quality" here).

I'll probably bump the version soon, but latest in master uses minQuantizer (--min) and maxQuantizer (--max) instead of "quality".