Add rtic-timer (timerqueue + monotonic) and rtic-monotonics (systick-monotonic)

rtic-monotonics/.gitignore

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+**/*.rs.bk
+.#*
+.gdb_history
+/target
+Cargo.lock
+*.hex

rtic-monotonics/Cargo.toml

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+[package]
+name = "rtic-timer"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cortex-m = { version = "0.7.6" }
+embedded-hal-async = "0.2.0-alpha.0"
+fugit = { version = "0.3.6", features = ["defmt"] }
+rtic-timer = { version = "1.0.0", path = "../rtic-timer" }

rtic-monotonics/rust-toolchain.toml

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+[toolchain]
+channel = "nightly"
+components = [ "rust-src", "rustfmt", "llvm-tools-preview" ]
+targets = [ "thumbv6m-none-eabi", "thumbv7m-none-eabi" ]

rtic-monotonics/src/lib.rs

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+//! Crate
+
+#![no_std]
+#![no_main]
+#![deny(missing_docs)]
+#![allow(incomplete_features)]
+#![feature(async_fn_in_trait)]
+
+pub use rtic_timer::{Monotonic, TimeoutError, TimerQueue};
+
+pub mod systick_monotonic;

rtic-monotonics/src/systick_monotonic.rs

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+//! ...