SpaDES.docs 0.1.0

• drop support for R 4.1 and 4.2;
• prepManualRmds() gains argument ignoreModules. It matches whole module
  names; as a regex alternation it also dropped modules whose names merely
  contained one, and character(0) dropped everything;
• prepManualRmds() classifies each line of a module .Rmd once -- YAML, chunk
  header, chunk body, prose -- and each rewrite now works from that instead of
  re-deriving document structure with its own regex. Fixes a family of failures:
  a prose mention of root.dir treated as a setting, ## References inside a
  sentence treated as a heading, and a (ref:key) use in mid-paragraph treated
  as a duplicate definition and deleted;
• prepManualRmds() no longer aborts on a module with no setup chunk; it
  synthesizes one. Five of the fireSense modules have none, and each would have
  stopped the whole book;
• prepManualRmds() no longer crashes de-duplicating text references. It
  removed lines and then kept indexing the shortened vector with the original
  line numbers;
• prepManualRmds() warns instead of continuing silently when _bookdown.yml
  lists chapters that were not prepared, and when there are no modules to prepare
  at all. Note this does not yet cover #1, where the modules exist but every
  module line in _bookdown.yml is commented out;
• rebuildCache reaches the generated chapter when a module mentions
  cache.rebuild only in a comment;
• prepManualRmds() no longer deletes a module's prose along with its YAML header. It removed
  every line from the first --- to the last, so a --- thematic rule anywhere in a module's
  documentation took the header and all prose above the rule with it, silently. Only the header
  is removed now, and only when nothing but whitespace precedes it -- the same way
  SpaDES.core::moduleRmdToVignette() reads the file;
• modelr is no longer a dependency; modelr::seq_range() was the call that caused the above;
• the package has a testthat suite;