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An actor needs to be registered with a renderer when updated otherwise
one ends up with a ju pluging real screens to its fifties system. Hence
the two hours.

Fixing build tree on llvm.

See merge request !34

Add transforms to decorators.

Feature/decorators settings

See merge request !33

 - add hide/show helper function in base classe.
 - call restoreSettings when changing objectName

Feature/decorator collection

See merge request !30

Feature/decorator collection

See merge request !29

Merge branch 'feature/decorator_collection' of gitlab.inria.fr:dtk/dtk-visualization into feature/decorator_collection

Merge branch 'feature/decorator_collection' of gitlab.inria.fr:dtk/dtk-visualization into feature/decorator_collection

Decorators
- Move touch to draw
- Move draw to touch

Collection:
- move render to draw

Canvas:
- move touch to draw