for some reason, r-cran-rgl does not seem to work, so just install from source
include=FALSE implies stop_on_error = 2L
use testit instead of testthat
move inst/tests to tests/testit
typo: test_package -> test_pkg
use has_warning() to check if a warning was emitted
tweak the test for environments
factor out sapply(*, class) as list_class()
quite a few dirty hacks like rm_blank_plot() were moved to the evaluate package (0.4.4); feel tidy and fresh now
update plot tests accordingly
news for #562
write writeLines() only once, which is what I meant in #563
bump version