parser cleanup

[jerch]

The parser has accumulated needed changes over time. Part of #1823.

Things to do:

• remove Array fallback for the transition table
  This is not needed anymore since all supported engines have typed array support.
• simplify transition table creation
  With the transition table being a typed array the table can be prefilled with the default transition by a .fill call.
• dont recreate arrays in r() everytime, instead slice from a blueprint
• simplify unicode handling in parse
  Use the new NON_ASCII_PRINTABLE where appropriate and restore the error state as error state.

[Tyriar]

LGTM after adding some constants if it makes sense to