Merge branch 'sct-typestate' into 'master'

Cargo.toml

examples/pwm_sct.rs

examples/sct32.rs

examples/sct_32bit_pwm.rs

examples/sct_dual_16bit_pwm.rs

src/sct/access.rs

src/sct/event.rs

src/sct/mod.rs

src/sct/pins.rs