Cherry pick several changes back from 1.19.3

The main purpose of this is to backport the improved parse/runtime
errors to older versions. I think they're sufficiently useful that we
should try to make it as widely available as possible.

We've been running them for a week now on SC3 and the released version
and not seen any issues, so I think it's probably stable enough.

This is a pretty lazy commit: I ended up copying the whole ROM over and
then picking up a few other related changes along the way.

 - Trim spaces from file paths (b8fce1eecc)

 - Correctly format 12AM/PM with
   %I (9f48395596)

 - Fix http.request and htpt.websocketAsync not handling a few failure
   edge-cases correctly (3b42f22a4f).

 - Move the internal modules into the main package path, hidden under
   cc.internal (34a31abd9c).

 - Gather code coverage in Java instead of
   Lua (28a55349a9).

 - Make error messages in edit more
   obvious (8cfbfe7ceb).

 - Make mcfly's test methods global. This means we don't need to pass
   stub everywhere (7335a892b5).

 - Improve runtime and parse errors. This comes from numerous commits,
   but chiefly a12b405acf, and
   5502412181.

 - Hide the internal redirect methods in
   multishell (33b6f38339).

Note this does /not/ include the shebang changes (sorry Emma!). I've
tried to avoid adding any user-controllable features, mostly because I
don't know how to handle the versioning otherwise :).

src/test/resources/test-rom/spec/programs/move_spec.lua

@@ -21,7 +21,7 @@ describe("The move program", function()
         touch("/test-files/move/a.txt")
         fs.makeDir("/test-files/move/a")
 
-        expect(capture(stub, "move /test-files/move/a.txt /test-files/move/a"))
+        expect(capture("move /test-files/move/a.txt /test-files/move/a"))
             :matches { ok = true }
 
         expect(fs.exists("/test-files/move/a.txt")):eq(false)
@@ -29,7 +29,7 @@ describe("The move program", function()
     end)
 
     it("fails when moving a file which doesn't exist", function()
-        expect(capture(stub, "move nothing destination"))
+        expect(capture("move nothing destination"))
             :matches { ok = true, output = "", error = "No matching files\n" }
     end)
 
@@ -37,7 +37,7 @@ describe("The move program", function()
         cleanup()
         touch("/test-files/move/a.txt")
 
-        expect(capture(stub, "move /test-files/move/a.txt /test-files/move/a.txt"))
+        expect(capture("move /test-files/move/a.txt /test-files/move/a.txt"))
             :matches { ok = true, output = "", error = "Destination exists\n" }
     end)
 
@@ -45,17 +45,17 @@ describe("The move program", function()
         cleanup()
         touch("/test-files/move/a.txt")
 
-        expect(capture(stub, "move /test-files/move/a.txt /rom/test.txt"))
+        expect(capture("move /test-files/move/a.txt /rom/test.txt"))
             :matches { ok = true, output = "", error = "Destination is read-only\n" }
     end)
 
     it("fails when moving from read-only locations", function()
-        expect(capture(stub, "move /rom/startup.lua /test-files/move/not-exist.txt"))
+        expect(capture("move /rom/startup.lua /test-files/move/not-exist.txt"))
             :matches { ok = true, output = "", error = "Cannot move read-only file /rom/startup.lua\n" }
     end)
 
     it("fails when moving mounts", function()
-        expect(capture(stub, "move /rom /test-files/move/rom"))
+        expect(capture("move /rom /test-files/move/rom"))
             :matches { ok = true, output = "", error = "Cannot move mount /rom\n" }
     end)
 
@@ -63,12 +63,12 @@ describe("The move program", function()
         cleanup()
         touch("/test-files/move/a.txt")
         touch("/test-files/move/b.txt")
-        expect(capture(stub, "move /test-files/move/*.txt /test-files/move/c.txt"))
+        expect(capture("move /test-files/move/*.txt /test-files/move/c.txt"))
             :matches { ok = true, output = "", error = "Cannot overwrite file multiple times\n" }
     end)
 
     it("displays the usage with no arguments", function()
-        expect(capture(stub, "move"))
+        expect(capture("move"))
             :matches { ok = true, output = "Usage: move <source> <destination>\n", error = "" }
     end)
 end)