fix LibraryPanel's reloadTexture
fix polyline's symbol thumbnail
add shape's name
add Bezier's property
output shape's name
refresh Polygon after remove vertices
fix create PolygonShape when points number < 3
add press del to remove rect
add press del to remove circle
add press del to remove bezier
fix bug when del shape by mouse right button press
fix remove shape
insert new polyline to selection after created