Draw2D 0.7.6 released

Bug fixed: Selection test of a Z-Connector doesn't work propper. Z-Connector use the hit test of a normal line

Bug fixed: CommandAdd doesn't reconnect a Connection in the undo method.

Bug fixed: Missing call of Connection.disconnect if a Connection remove from the canvas. This enforce a exception.

Bug fixed: Missig include in demo application z-connector.

Feature added: Adding method setZOrder to the Line figure.

Feature added: Adding method isLine and isConnector to Figure and Line. Required for own Line/connection implementation.