Bug fix: New eval-envs should set *out* to stderr

- This issue was causing certain libraries, such as `spork/cjanet`, to cause incorrect RPC responses. When the library code involves printing to stdout, that data was being included in the stdout output sent to the LSP client. Putting stderr into `root-env`'s `*out*` means that evaluated imports wil print to stderr instead of stdout, avoiding the issue.

Author: CFiggers

src/main.janet

@@ -462,8 +462,9 @@
       (setdyn :opts opts)
       (when debug (setdyn :debug true)) #(setdyn :debug true)
       (setdyn :log-level log-level) #(setdyn :log-level 2)
-      (setdyn :log-categories @[:core ;(map keyword log-category)]) #(setdyn :log-categories [:core :priority :settrace])
+      (setdyn :log-categories @[:core ;(map keyword log-category)]) #(setdyn :log-categories [:core :priority :diagnostics])
       (setdyn :out stderr)
+      (put root-env :out stderr)
 
       (if console
         (start-debug-console)