Release v1.3

- New: Performance improving
- New: New error handling method (#3)
- New: Handle or throw syntax errors at pre-interpret-time
- New: Handle const values at pre-interpret-time
- New: Inner function can cache its outer call-scope (#1)
- New: Inner function can be pre-interpreted (call before define is
available) (#2)
- New: Max call-stack detection added
- New: Minus operator can be used to calculate elapsed milliseconds with
two date objects
- New: IDirectory interface is available to property access and
enumeration (#4)
- New: Information about functions and variables is available after
compiling
- Fixed: Function scope and call-scope has been fixed
- Fixed: Exception caused when array resizing has been fixed
- Changed: .NET IList interface can be accessed directly (DirectAccess
mode is unnecessary)
- Changed: Reform library namespaces