Missing tokens

[maciejhirsz]

Apparently we are missing following tokens:

• ~&&= should be OperatorLogicalAndAssign~*
• ~||= should be OperatorLogicalOrAssign~*
• # ? proposed use for private fields
• @ ? proposed use for decorators
• :: should be OperatorBind
• .. ? E4X specific, not sure if we even need it

Editing the enum will require altering all lookup tables, which is a bit of a chore.

* - those are apparently invalid in ECMAScript, some parsers recognize them internally as tokens but don't parse them.