Snabbdom supports svg, but it adds the namespace at the creation of the
virtual node. However, owl works slightly differently: it adds children
after creating the parent virtual node.
So, we need to actually call the addNS method after the children nodes
have been created.
As a bonus, this is slightly faster than snabbdom: we only check at
template compilation time once if a node is a svg.
Before this commit, hashchanges were not taken into account by the
router, if used in history mode.
Also, it's stupid, but i ran prettier on the codebase
Géry Debongnie