Log Message:
Updated libixion to 0.12.2.

    Up the version to 0.12.2.

    Update the CHANGELOG.

    Fix lexer tokenizer to get R1C1 addresses properly parsed.

    For now, a lexer name that contains a '[' and ']' pair can have any
    characters in-between, in order to have e.g. 'R[-5]C' properly
    parsed as a name.

    Fix a range address parsing error.

    It previously failed to parse 'R[-5]C:R[-1]C'.

    Add a test case that ixion currently fails to parse.

    Export these hash::operator(...) symbols.

    add CI config