feat(cursor): add crosshair options

Add persistent cursor sizing, pick aperture, color, pointer mode, isometric drafting planes, and SNAPANG-aligned grid behavior.\n\nRefs #413

src/app/update/command.rs

@@ -4,7 +4,7 @@
 use super::util::*;
 use super::{format_size, VIEWCUBE_HIT_SIZE};
 use crate::app::helpers::{
-    ortho_constrain, parse_coord, polar_constrain_near, ucs_rotate_vec, ucs_to_wcs, ucs_z_axis,
+    parse_coord, polar_constrain_near, ucs_rotate_vec, ucs_to_wcs, ucs_z_axis,
     CoordKind,
 };
 use crate::app::{Message, OpenCADStudio, POLY_START_DELAY_MS};