Hide the internal redirect methods in multishell

Previously it was possible to access all methods of the multishell
redirect by calling term.current(). This is definitely not intended, as
it leaks all sorts of internals to the user.

Also bump illuaminate - the new version is about twice as fast on my
machine.

gradle/libs.versions.toml

@@ -51,7 +51,7 @@ fabric-loom = "1.0-SNAPSHOT"
 forgeGradle = "5.1.+"
 githubRelease = "2.2.12"
 ideaExt = "1.1.6"
-illuaminate = "0.1.0-13-g689d73d"
+illuaminate = "0.1.0-19-gee6e843"
 librarian = "1.+"
 minotaur = "2.+"
 mixinGradle = "0.7.+"

projects/core/src/main/resources/data/computercraft/lua/rom/programs/advanced/multishell.lua

@@ -78,6 +78,11 @@ local function launchProcess(bFocus, tProgramEnv, sProgramPath, ...)
     else
         tProcess.window = window.create(parentTerm, 1, 1, w, h, false)
     end
+
+    -- Restrict the public view of the window to normal redirect functions.
+    tProcess.terminal = {}
+    for k in pairs(term.native()) do tProcess.terminal[k] = tProcess.window[k] end
+
     tProcess.co = coroutine.create(function()
         os.run(tProgramEnv, sProgramPath, table.unpack(tProgramArgs, 1, tProgramArgs.n))
         if not tProcess.bInteracted then
@@ -87,7 +92,6 @@ local function launchProcess(bFocus, tProgramEnv, sProgramPath, ...)
         end
     end)
     tProcess.sFilter = nil
-    tProcess.terminal = tProcess.window
     tProcess.bInteracted = false
     tProcesses[nProcess] = tProcess
     if bFocus then