Parse errors say "column xxx", but the number reported is the position within the file, not within the line

[richardfearn]

ply only tracks the position of tokens in the whole file (lexpos), but this is used incorrectly as a column number in the errors reported by pyhcl.

See this in the ply documentation:

https://github.com/dabeaz/ply/blob/master/doc/ply.md#line-numbers-and-positional-information

It should be possible to calculate the actual column number using lexpos.

[virtuald]

Seems reasonable, happy to accept a PR with a fix.