exif(): read HEIF/HEIC originals with exifreader (closes #145)

photo.exif() and backup-metadata --exif read EXIF with exifreader,
which reads JPEG, HEIC/HEIF, AVIF, PNG and WebP, so a HEIC original or
a live photo's HEIC image gets its EXIF. exifreader replaces
exif-reader and the hand-written JPEG segment scan. PhotoExif is
unchanged. The exif field of backup-metadata --exif is now
exifreader's tag output, and exifRaw holds the whole EXIF block it
could not read. Tests use a real 933-byte HEIC fixture, test/exif.heic,
whose recipe is in test/exif-heic.ts.

Model: opus-5-5

yarn.lock

@@ -702,6 +702,11 @@
     loupe "^3.1.2"
     tinyrainbow "^1.2.0"
 
+"@xmldom/xmldom@^0.9.10":
+  version "0.9.12"
+  resolved "https://registry.yarnpkg.com/@xmldom/xmldom/-/xmldom-0.9.12.tgz#1f84c07cb95ccf28202299f77b5fd7fc257151e8"
+  integrity sha512-5AXjrcMClTryPe9LgZrygpB1lj7s0S9E0+W+AHaVKAVyHanafK86iPSvG5xHVSp/jC+VH1UXu0TAEmY279xH7A==
+
 acorn-jsx@^5.3.2:
   version "5.3.2"
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"
@@ -1002,10 +1007,12 @@ esutils@^2.0.2:
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.3.tgz#74d2eb4de0b8da1293711910d50775b9b710ef64"
   integrity sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==
 
-exif-reader@2.0.3:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/exif-reader/-/exif-reader-2.0.3.tgz#259997735080bc6bb959c37b32c60f004ec4391d"
-  integrity sha512-zFbQvguwT9JkqyYhR7pjE1Yn8SagwaGLNRU0Oh14xFa1paSf5Gzxn4gxgk0XhnudI0UIqU+HgnBX93+nva592A==
+exifreader@4.46.0:
+  version "4.46.0"
+  resolved "https://registry.yarnpkg.com/exifreader/-/exifreader-4.46.0.tgz#b6216eae512997587c45114f972cc14ca979205f"
+  integrity sha512-ksHTpjXKWzbckY+bYlGaomG0EobHJkaMWLg5OPbzlTPda04F2dfrDfYSz8iAPp/kXYUSQdINBVI6nCAjQ8PQ/Q==
+  optionalDependencies:
+    "@xmldom/xmldom" "^0.9.10"
 
 expect-type@^1.1.0:
   version "1.3.0"