In [1], we rewrote the effect feature in the wowl infrastructure.
However, we lost something in the process: the "type" of effect
(basically "rainbow_man" as it is the only implemented effect)
became a mandatory param, whereas before it simply defaulted to
"rainbow_man" when not set. As a consequence, previously defined
effects in views could crash.
This commit fixes that issue, and reworks a bit the feature by
introducing a registry of effects, which easily allows to add new
effects from the outside. An effect is a function that may return
a Component (and its props) to display.
Most of the diff in the tests is about moving files where they
should be (the effect feature being in core/, the tests must be
in core/ as well, and not depend on the webclient).
[1] 0573acae23
Task 2652927
closesodoo/odoo#77109
X-original-commit: 74dc3f654ee5849982b494e46eefb1fc2b4e0c74
Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>