Pass par args via tpar

[grantmcdermott]

Closes #123.

MWE.

pkgload::load_all("~/Documents/Projects/tinyplot")
#> ℹ Loading tinyplot

# A plot with default params
tinyplot(mpg ~ wt, data = mtcars, facet = ~am)

# Set a mix of base and tinyplot global params
op = tpar(
    las       = 1,
    pch       = 2,
    facet.bg  = "grey90",
    facet.cex = 2,
    grid      = TRUE
)
# redraw the plot
tinyplot(mpg ~ wt, data = mtcars, facet = ~am)

# reset
tpar(op)
tinyplot(mpg ~ wt, data = mtcars, facet = ~am)

^{Created on 2024-03-15 with reprex v2.1.0}

Still to do:

• [x] Update tests
• [x] Update vignette

(Maybe decide about supporting palette() setting too.)