krauseNiazi2019Analyses: Reproducible analysis for tailfindr paper

fansi Release Notes

Systematized which control sequences are handled specially by adding the ctl parameter to most functions. Some functions such as strip_ctl had existing parameters that did the same thing (e.g. strip, or which), and those have been deprecated in favor of ctl. While technically this is a change in the API, it is backwards compatible (addresses #56 among and other things).
Added *_sgr version of most *_ctl functions.
nzchar_ctl gains the ctl parameter.
#57: Correctly detect when CSI sequences are not actually SGR (previously would apply styles from some non-SGR CSI sequences).
#55: strsplit_ctl can now work with ctl parameters containing escape sequences provided those sequences are excluded from by the ctl parameter.
#54: fix sgr_to_html so that it can handle vector elements with un-terminated SGR sequences (@krlmlr).
Fix bug in width computation of first line onwards in strwrap_ctl when indent/exdent/prefix/initial widths vary from first to second line.
Fix wrapping in strwrap2_*(..., strip.spaces=FALSE), including a bug when wrap.always=TRUE and a line started in a word-whitespace boundary.
Add term.cap parameter to unhandled_ctl.

fansi::set_knit_hooks makes it easy to automatically convert ANSI CSI SGR sequences to HTML in Rmarkdown documents. We also add a vignette that demonstrates how to do this.
#53: fix for systems where 'char' is signed (found and fixed by @QuLogic).
#52: fix bad compilation under ICC (@kazumits).
#51: documentation improvements (@krlmlr).
#50: run tests on R 3.1 - 3.4 tests for the rc branch only (@krlmlr).
#48: malformed call to error in FANSI_check_enc (@msannell).
#47: compatibility with R versions 3.2.0 and 3.2.1 (@andreadega).

Other minor fixes (#43, #46).

Remove valgrind uninitialized string errors by avoiding strsplit.
Reduce R dependency to >= 3.2.x (@gaborcsardi).
Update tests to handle potential change in substr behavior starting with R-3.6.