Have a dynamic children with a t-key. This child has a delayed willStart.
Change the key during a rendering.
Before this commit there was a leak: a component corresponding to an old key had been created, xwithout being destroyed.
After this commit, the outdated component is destroyed.
t-out automatically escaped content when it is a string not marked
with the `markup` function
t-out renders the raw content if it is a Block, or if it has been marked
with the `markup` funtion.
t-esc has been kept since it is safe and is optimized to render text nodes.
all t-raw calls are in fact the same as t-out.
Lucas Perais (lpe)