Assets 7

Various incremental updates to improve PropBASIC coverage.

  • Add PropBASIC manual to help menu
  • Add support for multiple builders per language definition
  • Add *.plib extension for included PropBASIC files
  • Report correct extension patterns in open/save dialogs
  • Rewrite save dialog to better support multiple filetypes; prevent build
    action from disabling when file contents have changed.
  • Rewrite program logic to clearly delineate on/off states of various file
    actions
  • Clear project view when all files are closed