Set ui.ui_container.clip_children to false
Fixes!

-event_data::update now clears existing data after every event cycle
-handler.event doesn't create event handlers unless they exist
Numerous changes

-DESCENDENTS_ONLY flag is no longer a table
-Switch from operators to raw* methods to ignore metamethods
-Recursive tables should no longer crash when merged or copied
-Add table_deepcopy_fast
-Rename table_merge to table_deepmerge and add a tighter-looped
table_merge
-Add a friendly comment to table_tree about the upcoming rewrite
Increment version!
Restructure the todo
Bare minimum demo
Change engine version syntax
Update to use deepmerge
Use table_deepmerge instead of table_merge
Add ui.text_label