This commit adapts the layout of icons in the UI to be more intuitive
and also adds some feedback on hover on some elements for clarity. Also
fixes a bug where an object line could be toggled on select.
This commit adds the code of the owl devtools extension.
This extension can be added on chrome or on firefox for
developpers to be able to inspect the contents of all owl
applications that are present on any web page, see all the
components, interract with them and their content to some
extend and perform a bit of profiling with their renders.