* added project option "Use of Deprecated Features causes Error" that maps to -de
  * tweaked parser to support new language features:
    - version(assert)
    - user defined attributes @identifier_opt(arguments) or @identifier
    - alias id = type
    - alias this = id
    - deprecated("message")
    - added keyword __parameters
  * tweaked parser to support undocumented language features:
    - ref anywhere in foreach type to support "foreach(const ref x; range)"
    - prefix lambda with function/delegate
    - added keyword __argTypes

  * syntax highlighting and semantic now fully support version identifiers according
    to http://dlang.org/version.html
  * improved parser/semantics:
    - fix "forgetting" type of function parameters after first evaluation
    - fix a number of crashes during semantics
    - improved parser recovery after too many closing braces