Namespace,Usage Symbols, Public and Recursive Inports

[adriancostin-sd]

Added

• Namespace and SysMLUsage symbol
• Public imports (Closes Recursive and Public Imports #203)
  • import symbolrule
    • with raw import statements to dynamically resolve imports if the targeted namespace changes
• Recursive imports
• Imports on all symbol types

Changed

• Moved scope definition to Namespace interface
• Replaced ecj plugin with manual ecj compiler usage

Fixed

• Parser compatibility for reference requirements and constraints