Fixes at least #357, #281 and #295

@zordius Not sure if this is the best possible fix to above issues, but it should prevent Parser from thinking that a "(" character inside quotes starts a new subexpression.

This still doesn't seem to correctly handle templates like {{test 'foo bar' (toRegex '^(foo|bar|baz)')}} (from #281 (comment)).

I found the issue - the $quotes = preg_match... regex is incorrect which prevents parsing certain single-quoted string arguments. I have fixed this in the latest release of https://github.com/devtheorem/php-handlebars.