Amend #6070

[teunbrand]

This PR replaces #6213 and fixes #6211.

A few mistakes crept into #6070, which this PR rectifies.
Essentially, the reverse parameter is now included into panel parameters and axes can use that to select a good placement for the axis line.

devtools::load_all("~/packages/ggplot2")
#> ℹ Loading ggplot2

p <- ggplot(mpg, aes(displ, hwy)) +
  geom_point() +
  theme(axis.line = element_line())

p + coord_cartesian(reverse = "xy")

For #6211 (comment), the plot is now centered and the title is placed reasonably.

p + coord_radial(
  start = 0.25 * pi, end = 0.75 * pi,
  reverse = "thetar", inner.radius = 0.3
)

^{Created on 2025-03-27 with reprex v2.1.1}

[thomasp85]

LGTM