Parser error recovery

[mckoss]

Bolt currently will only report one syntax error at a time (the first one found).

Expect:

The parser to advance to the next statement and resume parsing so all the errors in the file can be reported on (and fixed) at once.

[mckoss]

Note the poor error messages for problems like this:

path /x {
  read(): true
}

Result:

bolt:1:1: Expected comment, end of input, function definition, path statement, type statement or whitespace but "p" found.

Expect something like:

bolt:2:9: Expected "=" but ":" found.