Allow "game" to be a character vector for ruleset generation

[trevorld]

Create a pdf with multiple indicated game rules concatenated together

• Could more easily eyeball how changes affect multiple rulesets
• In particular ensure pamphlets, pocketmod, 2-column rulesets are one-page

• Could first generate individual pages and then concatenate

  • Could concatenate within XeLaTeX using pdfpages
  • Or perhaps concatenate outside {qpdf} package or some command-line tool

• Could also add pdf table of contents either within XeLaTeX or add pdf table of contents afterwards with gs (like we do in {piecepackr})

• save_ruleset() basic support

• save_ruleset() also supports pdf table of contents

• save_pamphlet() basic support

• save_pamphlet() also supports pdf table of contents

• save_pocketmod() basic support

• save_pocketmod() also supports pdf table of contents

[trevorld]

• I've written {xmpdf} to make this easier to do