Work on string key stored properties.

Cargo.lock

crates/api/src/application/mod.rs

crates/api/src/application/window.rs

crates/api/src/event/mouse.rs

crates/api/src/layout/fixed_size.rs

crates/api/src/layout/grid.rs

crates/api/src/layout/mod.rs

crates/api/src/layout/padding.rs

crates/api/src/layout/scroll.rs

crates/api/src/layout/stack.rs

crates/api/src/layout/text_selection.rs

crates/api/src/macros.rs

crates/api/src/prelude.rs

crates/api/src/properties/layout/point.rs

crates/api/src/properties/mod.rs

crates/api/src/render_object/clear.rs

crates/api/src/render_object/font_icon.rs

crates/api/src/render_object/image.rs

crates/api/src/render_object/mod.rs

crates/api/src/render_object/pipeline.rs