Visual D 1.4.1-beta4

changes from beta3:

• mago:
  • added option to select what type of property functions can be implicitly called.
  • fixed calling functions with slices or larger structs
  • improve shortened names in call stack
  • better propagate the raw option modifier (!) to expanded expressions
  • don't fail enumerating child expressions if one fails, show error for this item instead
• dmdserver: fixed intellisense on TemplateInstance!Argument