0.12.0

Added

• flipperzero::gpio::i2c, providing a Rust interface to the external 3.3V I2C
  bus over GPIO pins C0 and C1, as well as the internal (power) I2C bus.
• flipperzero::furi::string::FuriString::into_raw, allowing ownership
  of the string to be able to be handed over to C code.

Changed

• Updated to SDK 73 (firmware 1.0.1🥳).
• Switched to nightly-2024-09-10 compiler
• flipperzero_rt::entry macro now requires a function with type signature
  fn(Option<&CStr>) -> i32 instead of fn(*mut u8) -> i32.
• flipperzero::furi::string::FuriString::as_mut_ptr is now public to allow for
  it to be used with low-level C APIs (e.g. furi_string_printf).

Removed

• flipperzero::toolbox::{Md5, Sha256} (due to their removal from the Flipper
  Zero SDK API).
• flipperzero_sys::c_string!, since CStr literals are stable now
  and the macro did not provide any validations.