v0.6.0

Kill them all, but fast

Improvement has been made on the internal method _destroyChildren which should make
the call of clearContent and destroy faster to execute.

Getting so classy

Using now the API of classList from DOMTokenList for every class name operation.
We are using a shim to make sure to be compatible with older browser.
⚠️ toggleClassNames is now deprecated in favor of toggleClassName