Preparing for the first release :
- repaired AtomValue for some missing methods and errors
- changed pragma syntax for allowing pragma with no arguments
- added a LibsManager singleton class for dynamically control which libraries are available with the @import pragma
- added a Core library (builtin) to enable dynamic casts in script (with syntax cast(type.$thetype$, $expr$)
- added an isof function to check type of user pointer value, syntax : vector.isof($expr$).
- added a better test script