Add the '@' character as a reflection operator

[ShawnClake]

The grammar might look like:
reflection: AT label;
AT : '@';

If the label corresponds to a symbol of type script OR if the label corresponds to a variable holding a script instance it will return:

• driver
• path
• script options if they exist
• a list of script scope symbols inside of the script

If the label corresponds to a primitive it will return:

• None