Feat/current agile repo state

[vahidm1993]

• Fix the default primary font name
• Fix many minor GUI bugs
• Add skip & skip all buttons in the dialog of the broken libraries during loading a broken session
• Set the default directory of the dialog during saving a state machine in accordance with the chosen library in the library tree
• Create the data flows & data ports automatically in the nested states
• Create the data port automatically when the other state does not have one during connecting the data flows
• Support waypoints for data flows
• Custom background color for states