x16 r39: update vtui lib and example

compilerAst/src/prog8/ast/statements/AstStatements.kt

@@ -1092,6 +1092,7 @@ class Pipe(override var source: Expression,
 // Calls to builtin functions will be replaced with this node just before handing the Ast to the codegen.
 // this is meant to eventually (?) be able to not have any FunctionCallStatement nodes to worry about anymore
 // in the codegen, because they have been converted into GoSub (for instance) or this node.
+// However, if/when the codegen is moved over to use the new CodeAst (PtProgram etc etc) this is all moot.
 class BuiltinFunctionCallStatement(override var target: IdentifierReference,
                                    override var args: MutableList<Expression>,
                                    override val position: Position) : Statement(), IFunctionCall {

docs/source/todo.rst

@@ -6,7 +6,6 @@ For next release
 - x16: add new keyboard APIs https://github.com/commanderx16/x16-docs/blob/master/Commander%20X16%20Programmer%27s%20Reference%20Guide.md#keyboard
 - x16: optimize diskio load_raw because headerless files are now supported https://github.com/commanderx16/x16-rom/pull/216
   note: must still work on c64/c128 that don't have this!
-- x16: fix wormfood (requires new VTUI lib)
 
 - vm codegen: When
 - vm codegen: Pipe expression

examples/cx16/vtui/testvtui.p8

@@ -11,7 +11,7 @@ main {
         store_logo()
 
         txt.lowercase()
-        vtui.screen_set(2)
+        vtui.screen_set(0)
         vtui.clr_scr('%', $50)
         vtui.gotoxy(5,5)
         vtui.fill_box(':', 70, 50, $c6)
@@ -110,7 +110,7 @@ char_loop:
 
 vtui $1000 {
 
-    %asmbinary "VTUI0.8.BIN", 2     ; skip the 2 dummy load address bytes
+    %asmbinary "VTUI0.9.BIN", 2     ; skip the 2 dummy load address bytes
 
     ; NOTE: base address $1000 here must be the same as the block's memory address, for obvious reasons!
     ; The routines below are for VTUI 0.8