Lua Computer: collection of minor updates, none notable (read romapidoc)

Former-commit-id: 80e3f0d13c2dc5bcff0843e509f416e9314cd52e
Former-commit-id: e7e35bfd23d70db84f568f0c5388f3a1d89222bc

src/net/torvald/terrarum/virtualcomputer/luaapi/Filesystem.kt

@@ -456,6 +456,7 @@ internal class Filesystem(globals: Globals, computer: BaseTerrarumComputer) {
         }
     }
 
+    /** returns NO line separator! */
     private class FileClassReadLine(val fr: FileReader) : ZeroArgFunction() {
         val scanner = Scanner(fr.readText()) // no closing; keep the scanner status persistent