Big revamp of outputting

[jsakaluk]

• Separate functions for tables and figures (if any at all for figures)
• For tables: just return gt() object (don't write/leave that to Rmd)
• Consider eliminating figure export (and build semPaths into vignettes)

[jsakaluk]

• returned table objects should just be dfs (given plurality of companion functions)

[jsakaluk]

Outputter revamp goals:

• [x] partition outputModel() to two functions: outputParamTab() for tables (optionality around measurement, structural both) and outputParamFig() for path diagram
• [ ] getConstraintTests() should be transitioned to outputConstraintTab()
• [ ] getInvarCompTable() should be transitioned to outputInvarCompTab()
• [ ] All table-based outputters should have an argument gtTab that defaults to FALSE; if TRUE, should embed in a simple gt::gt() wrapper for presentation (e.g., in knit Rmd or Quarto), else (default) should return a tibble (which the user can subject to gt() and/or ggplot and/or whatever
• [ ] All outputters (table and figure based) should have CRAN-compliant writeTo and fileName options