Scripts: File › Scripts lists the Scripts folder, subfolders as submenus

File › Scripts now lists the .js and .jsx files of the Scripts folder next
to the preferences, each named after its file without the extension, with
each subfolder as a submenu, above Check Script… and Other Script…. The
help page describes this listing:
https://helpx.adobe.com/illustrator/desktop/automate-visualize-data/automate-actions/install-and-run-scripts.html

Choosing a listed script runs it through script.run without the warning
Other Script… shows. script.listInstalled returns the same listing, and
ui.runInstalledScript {path} runs one entry.

VectorCraft's own rules: the folder is read off the UI thread when the
app starts, when its window becomes active and when the File menu of the
window's menu bar opens; only names are read; links, junctions, hidden
and system entries are left out and checked again before a run; one read
stops at 2,048 entries, 512 scripts, 128 subfolders, 4 levels or 250 ms
and the menu then notes that some scripts were not listed. Under an
automation read root, script.listInstalled and ui.menu.list leave out a
folder outside the root.

#1183 (LloydNicholson) also proposed a Scripts menu listing a folder.

crates/engine/src/script/mod.rs

@@ -36,6 +36,8 @@ use crate::{
     Clipboard, DocState, DrawMode, EngineError, Journal, NodeId, PaintDefaults, Result, Session, cmd, command_specs, guard, waits_for_tool_edit,
 };
 
+pub mod folder;
+
 /// The most bytes of source a run takes, as a file or as `source`.
 pub const MAX_SOURCE_BYTES: usize = 8 << 20;
 /// The instructions a run may execute when `maxFuel` is left out.