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.
Compiling a template with a dash ("-") in its name generates an
invalid function name in the compiled code.
A template named `"my-component"` leads to the function
`function my-component(app, bdom, helpers) { ... }` which has an
invalid name.
closes#1333