ignoring .app
Corrected a bug preventing the suppression of a focused timebox.
Unused elements deleted or became private
Delete QAction added to suppress a timebox in smallView

Appears in Edit menu, and linked to a shortcut (Ctr + Backspace in Windows, and Cmd + Backspace in Mac)
The older way to delete has been commented for recycling.
Merge branch 'dev' of https://github.com/OSSIA/i-score into dev
cleaning of MainWindow

old stuff deleted or actualized and comments added
Doxygen changes
Bug corrected. TimeboxHeader was deleted lonely in case of selection.

Destructor of timebox is now called in case of Delete (not only timeboxSmall)
Timebox is not going small if it's the main one.

Cleaning of Timebox, and comments added.
Doxygen documentation page
Doxygen comments in GraphicsView class
Creating a Timebox by dragging the mouse is much more tested. Doxygen comments added in ScenarioView.

Adding a Timebox (smallView) is now allowed only if Dragmode property is NoDrag, and the temporaryBox is contained inside the scenario.
TimeEvent architecture is recasted with presenter model design pattern.

Various changes, especially State class renamed to StateDebug to avoid name problems with OSSIA::State and Doxygen comments added.
New doxygen explanation page
Adding a TimeEvent with Cmd+LeftClick in plugin Scenario
Timebox surrounded by two TimeEvent at creation
Merge branch 'dev'

Conflicts:
	headers/timeboxmodel.hpp
Merge branch 'master' of https://github.com/OSSIA/i-score