Major optimization 6x faster

[Curid]

RTP to MPEGTS benchmark.
Before: 33556858 ns/op  4763101 B/op
After:   5169437 ns/op  3881852 B/op

I wrote this a few months ago and have been using it in production for weeks on end without issues. I no longer have a use for mpegts library, so I figured you could have it. There may be some small breaking changes, but all tests pass.

Changes:

• Use icza/bitio for bit manipulation
• Dynamic CRC32 calculation
• Don't use fmt.Sprintf when parsing timestamp

[asticode]

Thanks! Could you create a PR with the optimizations only and not the reformatting/linting changes ?