Sorry, there was too much red on my screen for me to concentrate

Fixes #11482

Explanation, copied from the issue: RCLs don't have an absolute
`BaseIntermediateOutputPath`, so we end up seeing `<current
directory>\obj` as the obj path, and we have a `Directory.Exists` check
that catches if that happens, and falls back to different logic for an
RCL. Turns out current directory is the solution folder, and so
sometimes that obj path does exist, but it exists for a different
project, and then all sorts of fun shenanigans ensue.

Fixes #7025

Turns out in the old options screen we weren't setting two of the
options to honour user choices, and we were also clobbering their choice
for one of them every time the screen opened.

Two tests that run for an hour, adding and removing components and
verifying that classification is correct afterwards. One uses an RCL,
one doesn't.

The tests are setup to not run in CI, only manually on dev machines, so
as not to delay the CI runs, and because sometimes these have a
different version of "success" :)