Update grammar

[OsamaSBCrea]

This PR updates the grammar to match the latest version of the ANTLR grammar in RAICode. The main reason to do it is to solve the issue of trailing commas/semicolons in expressions, for example

def output = {1, 2, }
def output = {1 ; 2 ; }

Here is a list of some introduced changes:

• Remove OverrideExpression, RestrictExpression, LogicalExpression and SpecializeExpression, and define them implicitly within BasicExpression.
• Rename LogicalParam to BasicParam
• Rename FormalParam to Formal
• Rename FormalParams to Formals
• Rename FormalParamsBracket to FormalsBracket
• Rename FormalParamsParen to FormalsParen
• Rename JoinExpression to ProductExpression
• Add IffXorExpression
• Change UnionExpression and ProductExpression to handle trailing commas/semicolons