Treat paths as paths, rather than strings. Removes the requirements that
doom-*-dir variables end in slash (though I'll continue doing so as a
convention). Also moves a lot of cache/data into the current profile's
cache/data directories. Shouldn't actually affect anything for folks not
using Doom's profile system (yet).
Fix: #8616
BREAKING CHANGE: This deprecates the IS-(MAC|WINDOWS|LINUX|BSD) family
of global constants in favor of a native `featurep` check:
IS-MAC -> (featurep :system 'macos)
IS-WINDOWS -> (featurep :system 'windows)
IS-LINUX -> (featurep :system 'linux)
IS-BSD -> (featurep :system 'bsd)
The constants will stick around until the v3 release so folks can still
use it -- and there are still some modules that use it, but I'll phase
those uses out gradually.
Fix: #7479
featurep! will be renamed modulep! in the future, so it's been
deprecated. They have identical interfaces, and can be replaced without
issue.
featurep! was never quite the right name for this macro. It implied that
it had some connection to featurep, which it doesn't (only that it was
similar in purpose; still, Doom modules are not features). To undo such
implications and be consistent with its namespace (and since we're
heading into a storm of breaking changes with the v3 release anyway),
now was the best opportunity to begin the transition.
Its former logic would only return a correct path if both
main.{lua,moon} and src/main.{lua,moon} exist within the same project,
which is very unlikely.
