_clean_attrs.sed:
* improved deleting default ids
* delete 'stroke- *' properties if an object doesn't have a stroke
* delete enable-background from non-container elements
* delete fill-rule from elements that ignore it
_clean_style_attr.sed:
* delete fill-rule from elements that ignore it
_svgo.yml:
* move cleanupAttrs down to fix sortAttrs
* enable removeViewBox plugin
* enable removeHiddenElems plugin
* disable cleanupIDs plugin