simplify template

flow3-rs-demos/.cargo/config.toml

flow3-rs-demos/Cargo.lock

flow3-rs-demos/Cargo.toml

flow3-rs-demos/rust-toolchain.toml

flow3-rs-demos/src/demo_tasks.rs

flow3-rs-demos/src/main.rs

flow3-rs-demos/src/ui/main_menu.rs

flow3-rs-demos/src/ui/mod.rs

flow3-rs-rt/src/flow3r.rs

flow3-rs-rt/src/runtime.rs

flow3-rs-template/Cargo.lock

flow3-rs-template/Cargo.toml

flow3-rs-template/src/main.rs

flow3-rs/src/input.rs