Add more missing svg atoms

Author: noahbald

web_atoms/local_names.txt

@@ -527,6 +527,7 @@ markerUnits
 markerWidth
 marquee
 mask
+mask-type
 maskContentUnits
 maskUnits
 math
@@ -786,6 +787,7 @@ ping
 pitch
 placeholder
 plaintext
+playbackorder
 plus
 pointer-events
 points
@@ -993,6 +995,7 @@ thead
 thickmathspace
 thinmathspace
 time
+timelinebegin
 times
 title
 to