cu29-clock 1.1.0

Copper Robot Clock implementation. It is a monotonic high precision clock for real time applications. It has a mock feature for testing time dependent behaviors. It is part of the Copper project but can be used independently.
Documentation 
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// Raw counter backend selection lives here so the public clock implementation
// does not grow target-specific cfg routing. Each backend exports:
//
// - `initialize()`
// - `read_raw_counter() -> u64`
//
// Backend files document the clock source and the guarantees Copper relies on.
#[cfg_attr(target_arch = "aarch64", path = "aarch64_cntvct.rs")]
#[cfg_attr(
    all(copper_cortex_r, target_os = "none", target_arch = "arm"),
    path = "armv7r_pmu.rs"
)]
#[cfg_attr(
    all(not(copper_cortex_r), target_os = "none", target_arch = "arm"),
    path = "cortex_m_dwt.rs"
)]
#[cfg_attr(target_arch = "riscv64", path = "riscv64_rdcycle.rs")]
#[cfg_attr(
    all(feature = "std", target_arch = "wasm32", target_os = "unknown"),
    path = "wasm_instant.rs"
)]
#[cfg_attr(target_arch = "x86_64", path = "x86_64_rdtsc.rs")]
#[cfg_attr(
    not(any(
        target_arch = "x86_64",
        target_arch = "aarch64",
        all(target_os = "none", target_arch = "arm"),
        target_arch = "riscv64",
        all(feature = "std", target_arch = "wasm32", target_os = "unknown")
    )),
    path = "std_system_time.rs"
)]
mod selected;

pub use selected::*;