[RTP/RTCP] bump rtp version to v0.7.0 and rtcp version to v0.8.0

[RTCP] remove unnecessary async function/trait

update rust-version: 1.60.0 ==> 1.63.0

general: apply clippy lints (#407)

* general: update crates to 2021 edition.

* general: apply clippy --fix

* general: apply manual clippy lints

* cargo fmt.

Remove trailing spaces in 'README.md' files

Resolve remaining `clippy::identity_op` warnings

Resolve change-requests from code review

Silence `clippy::needless_update` warning in tests

Replace if-let on `Result<T, E>` with `panic!(…)` on `else` with `assert!(opt.is_ok(), …)

Remove unreachable code

Remove needless use of `vec![…]` (vs. `[…]`)

Remove unnecessary deref

Remove unnecessary `let _ = …` of unit value (`()`)

Remove redundant `t as T` cast

Replace `assert!(true)` with `{}`

Replace `assert!(false, …)`/`assert!(false)` with `panic!(…)`/`panic!()`

Fix a few clippy warnings

Unify `assert_eq!(…)`/`assert_ne!(…)` to take args in order of `…!(actual, expected)`

While there isn't an explicit convention for this in Rust the stdlib docs all use `assert_eq!(actual, expected)`

Unify `assert_eq!(…)`/`assert_ne!(…)` to take args in order of `…!(actual, expected)`

While there isn't an explicit convention for this in Rust the stdlib docs all use `assert_eq!(actual, expected)`, making it a sort of implicit convention.

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upgrade to chrono 0.4.23

fix deprecations for chrono

Release interceptor v0.8.2

Fix over-NACK due to NackPair lost_packets not resetting (#372)

Co-authored-by: Olof Kraigher <[email protected]>

Fix clippy for rust 1.66 (#369)

Fix overflow in RTT calculation (#350)

Release interceptor version 0.8.1