core: Extend list of image formats to be stored in the clipboard manager

These types are probably common enough to support.

See also:
https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Complete_list_of_MIME_types

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1034

(cherry picked from commit b91d66bf98)

src/core/meta-clipboard-manager.c

@@ -32,9 +32,13 @@ static struct {
   const char *mimetype_glob;
   ssize_t max_transfer_size;
 } supported_mimetypes[] = {
+  { "image/gif",                MAX_IMAGE_SIZE },
   { "image/jpeg",               MAX_IMAGE_SIZE },
+  { "image/webp",               MAX_IMAGE_SIZE },
   { "image/png",                MAX_IMAGE_SIZE },
   { "image/bmp",                MAX_IMAGE_SIZE },
+  { "image/tiff",               MAX_IMAGE_SIZE },
+  { "image/svg+xml",            MAX_IMAGE_SIZE },
   { "text/plain",               MAX_TEXT_SIZE },
   { "text/plain;charset=utf-8", MAX_TEXT_SIZE },
 };