Try to update when param modifications.

I want to reload all param wrappers of a node, when only one is modified. But problem : dictonnary of slots changed !
Reorganize managers.

One manager exposes is QML : buttleManager.
This manager (singleton) contains 3 others manager : nodeManager, connectionManager, viewerManager.

This commit is just in order to have a more clean code.
Merge branch 'iss24' into develop

Conflicts:
	buttleofx/core/graph/connection/connection.py
	buttleofx/manager/connectionManager.py

Warning : iss24 is not already finished !
Merge branch 'develop' of github.com:buttleofx/ButtleOFX into develop

Conflicts:
	buttleofx/MainWindow.qml
	buttleofx/core/params/param.py
	buttleofx/gui/graph/graphWrapper.py
	buttleofx/gui/graph/qml/GraphEditor.qml
	buttleofx/gui/graph/qml/Tools.qml
	buttleofx/gui/paramEditor/wrappers/booleanWrapper.py
	buttleofx/gui/paramEditor/wrappers/paramEditorWrapper.py
	buttleofx/manager/buttleManager.py
	buttleofx/manager/nodeManager.py