Correction in case of undefined nodewrapper name
add a scrollbar in parameter display

fix a mistake present in my previous commit, there was no scrollbar in
parameter display
You can choose to display files in listview or in gridview and selected file is highlight
Browser: use layouts and fix suggestions popup menu position
Tooltip for parameters' hints

add a tooltip qml file
a tooltip spawn when the cursor hover the title's name
in this tooltip is written the description of the parameter if it exists

still a problem of display for the tooltip
Fix for undefined nodeWrapper
simplify code of the last commit
A verification for the connections is used in python
Fix for the dropArea (drag and drop of a node over a connection).
Early reflection on multiselection
Merge branch 'dev_graph' of https://github.com/buttleofx/ButtleOFX into dev_browser

Conflicts:
	buttleofx/MainWindow.qml
	buttleofx/gui/browser/qml/Browser.qml
	buttleofx/gui/browser/qml/WindowFiles.qml
Merge branch 'dev_menu' of https://github.com/buttleofx/ButtleOFX into dev_browser

Conflicts:
	buttleofx/MainWindow.qml
	buttleofx/gui/paramEditor/qml/ParamString.qml
Connections are now more secure
I bypassed the class idClip because i didn't manage to get it work.
A color code shows if a connection is possbile, impossible or can be replaced
A connection can be replaced by another one if you try to draw a connection at the emplacement of an existent one.
change some displays

add a window which display node properties
add a window to display plugin hints
Drag&Drop from outside the app
Merge + Multiselection :

- Merge branch 'feature/MenuQML' of https://github.com/buttleofx/ButtleOFX into dev_browser

- Multiselection : get the selected Items list and Open its components (in extern for the moment)

Conflicts:
	buttleofx/MainWindow.qml
	buttleofx/gui/browser/qml/Browser.qml
	buttleofx/gui/browser/qml/WindowFiles.qml
beginning of Plugin doc in a window

beginning of Plugin doc in a window
The drag is from a clip is disabled if a connection already exists