litedown v0.4

• Provided an option options(litedown.roam.cleanup = TRUE) to clean up the *__files/ directory after previewing .Rmd or .R files via litedown::roam() (thanks, @TimTaylor, #36).

• Added the keyboard shortcut Ctrl + K (or Command + K on macOS) for rendering a file to disk in the litedown::roam() preview.

• Cross-references also work for LaTeX output now.

• Fixed an error in the internal function detect_pkg() during R CMD check on CRAN.

• Set options(bitmapType = 'cairo') on macOS only when xquartz is available (thanks, @TimTaylor, #39). Previously only capabilities('cairo') was checked, which was not enough. This option can also be manually set via options(bitmapType) in a code chunk if the automatic switch to cairo is not desired.

• Fixed the bug that indented or quoted code blocks are not correctly indented or quoted when a code expression contains multiple lines.

• Fixed the bug that the span syntax [text](){...} doesn't work when text contains markup (e.g., bold or italic).