refacto dnd add sprite
refacto dnd remove sprite
current dnd, need to fix drop
drag & drop functionnal between 2 windows, segfault still there*
fix segfault (useless delete)
transfer addSprite into release event (already placed items can be moved)
throw dices through user list
drag & drop from item list
Merge branch 'DragnDrop'

Conflicts:
	src/MainWindow.cpp
	src/jdrnix.pro
added database object
add database object
add database class
ignored database file