Rename signal tests package. Haxe 3 syntax fixes.
Remove old XMLHttpRequest.

TODO: Move the IE compat __init__ somewhere else.
Remove ListNode. It turned out to be pretty lame.
This fixes Wire haxe-cpp,gcc compile errors.
Remove (incorrect) generated StyleSheet.
Move non-munit stuff to prime.hxml, for API docs.
Remove munit generated Haxe files.
Remove Layout example StyleSheet from AllClasses.
Moar! Haxe 3 fixes.
Reorder utils.Bind "overloads" for Haxe 3.
Update ComposedGraphicProperties to use
 invalidation signals.
Un-@:generic some more :-(
All libraries compile with munit 2!