[CHANGES]

• Updates to XS::Parse::Infix for latest infix-plugin perl5 branch
  
  • Requires classification to set the operator precedence
    
  • No longer need XPI_OPERAND_ARITH or XPI_OPERAND_TERM; most of
    .lhs_flags and .rhs_flags are redundant now
    
  • No longer support XPI_OPERAND_CUSTOM
    
  • Optional parse phase for parametric/hyper-operators
    
• Bump XS::Parse::Infix ABI version to 2
  
• Declare XPI ABI v0 as deprecated, soon to be removed