Add clip attribute, cleanup
Cleanup
Send events by default for setters
Fix constraint application for onxxx event handler attributes
sendEvent() should not set values, do that in setAttribute() instead. Use sendEvent instead of trigger() internally
Set default values for builtin view attributes
Clean up destroy code

Avoid splicing an array that's being interated on
Remove underscore dependency
Move sprite-specific routines to sprites
Add inputtext, support for keyboard events