In-game campaign, map and block script editors

Mission graph with branches, mission settings and goals, map editor on the
3D view (terrain, places, units, towers, traps, forts, rivals, zones; undo,
brush, rectangle, fill, mirror), block editor with palette, nesting, live
problems, undo, copy/paste and search; test play with a script debug view;
demo campaign and built-in missions as templates.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/mscript.rs

@@ -328,11 +328,6 @@ fn engine() -> Engine {
     e
 }
 
-// compiles a program (for the editor's check and for running); Err: the error text
-pub fn compile(code: &str) -> Result<(), String> {
-    engine().compile(code).map(|_| ()).map_err(|e| e.to_string())
-}
-
 // runs one function of the mission's program; returns the actions or an error
 fn run_fn(g: &Game, code: &str, name: &str, vars: &mut BTreeMap<String, f64>, rng: &mut u32, event: EventInfo) -> Result<Vec<Act>, String> {
     PROGRAM.with(|p| {