get_current_clickable_draw_target(): Remove log message
Enable clickable draw targets of all sections (previously only the topmost one's cdts worked)
No current cdt when h1e.mouse.out
Fix __hide cdt handling
Propagate mouseup/down events downwards in the section stack
If clicking on a cdt, don't emit regular mouseup event
Always disable mouseup events if there is a cdt in the way (hidden or not)
h1e.measure_text(), h1e.draw_text(): Built-in text drawing