Lib::IdeWidget: Create and add icons resources
Lib::IdeWidget: Creat class bottom chooser
ClosableWidget: Connect to destroy element of current widget

- Syntax correction (private methode)

Signed-off-by: Guilhem Vallat <guilhem.vallat@gmail.com>
BottomPanelChooser: First implementation
ClosableWidget: fix removing and destroy handling
BottomPanelChooser: Make sure that only one open action is checked
BottomPanelChooser: Handle widget destruction (and fix destructor)
IDEMainWindow: Use BottomPanelChooser
MyIdeMainWindow: Add some dummy_content