Add pointerevents.vim

See also: http://www.w3.org/TR/pointerevents/

This resolves #46.

test/test.html

@@ -473,6 +473,13 @@
 }
 </style>
 <style>
+.pointerevents {
+  touch-action: pan-x;
+  display: pan-y;
+  display: manipulation;
+}
+</style>
+<style>
 .position-3 {
   offset-before: sticky;
   offset-end: auto;