Scripts: the Startup and Shutdown folders run at launch and quit

Scripts in Scripts/Startup and Scripts/Shutdown in the settings folder
were never run. The desktop and web apps now run the Startup scripts at
launch, before a project opens, and the desktop app runs the Shutdown
scripts as it quits, after the project is closed. Each folder runs in
alphabetical order with case ignored, and files larger than 16 MiB are
not run. A Startup script that fails is reported in a toast and in the
log, a Shutdown script that fails is reported in the log, and the next
one still runs.

A Startup script that waits in a modal dialog goes on when the dialog
closes, while the next scripts run. A Shutdown script's dialogs close
as if canceled. With the settings folder on disk, each script runs as
its file, so #include, $.fileName and $.evalFile resolve against the
script's own folder.

The new commands file.runStartupScripts and file.runShutdownScripts
return the scripts that ran, those still waiting in a dialog, and those
that failed. Like script.run, both are refused in confined automation
sessions, in batches and in script steps, which now read one list of
script commands (RUNS_SCRIPTS). The list also holds window.scriptPanel
and window.restoreScriptPanels, which run ScriptUI panel scripts and
were not refused on main either. The apps still call
window.restoreScriptPanels at launch. plugins.md, scripting-parity.md,
gaps.md, target-app-parity.md and agents.md describe the folders. Each script
still runs in its own global scope, so a Startup script's variables are
not available to later scripts.

crates/script/src/runtime.rs

@@ -126,7 +126,7 @@ pub(crate) fn js_str(s: &str) -> JsValue {
 fn native_exec(_: &JsValue, args: &[JsValue], ctx: &mut Context) -> JsResult<JsValue> {
     let id = arg_string(args, 0, ctx)?;
     let mut params = arg_json(args, 1, ctx)?;
-    if id == "script.run" || id == "file.runScript" {
+    if effectcraft_engine::commands::scripts::RUNS_SCRIPTS.contains(&id.as_str()) {
         return Err(throw("scripts can't run scripts"));
     }
     let keys = params.as_object_mut().and_then(|o| o.remove("__keys"));