Sketch out some parsers
Start contemplating how spec guessing might work
Use roxygen2 to generate namespace
Refine spec specification
Export & document count_lines.
Change default to header = FALSE
Continuing to refine spec
Delimited string parsing in C++
Add strict and collapse parameters
Add basic tests
Correct default quote parameter
Test string escaping
Add tests for strict mode.
Realise that an unterminated doubled escape just terminates the string
Deal with final char = delim
Slightly better behaviour for unterminated escape.
(when not in strict mode)