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140.1

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flac: add Encoder API to encode audio samples and metadata blocks (#32)

* flac: encode frame header

* flac: calculate CRC-8 when encoding frame headers

* flac: fix encoding of frame header

* flac: add preliminary subframe encoder

* flac: fix UTF-8 encoding of frame number

* frame: add sanity check for sample count in decodeLPC

Updates #31.

* flac: update flac encoding API, depricate flac.Encode

Encode has been removed in favour of using NewEncoder.
The Encode function was temporarily added to support
re-encoding FLAC streams to update the metadata, but
it had no support for encoding audio samples.

The added flac.Encoder has support for encoding both
metadata and audio samples. It also does not require
that you first decode a FLAC file to later re-encode
it by calling Encode (as was the previous behaviour).

* flac: add MD5 running hash of unencoded audio samples to StreamInfo

* flac: remove unused encodePadding

Reported by golangci

* flac: fix golangci lint issues

	frame/utf8.go:57:6: `decodeUTF8Int` is unused (deadcode)
	func decodeUTF8Int(r io.Reader) (n uint64, err error) {
		  ^
	internal/utf8/encode.go:32:16: unnecessary conversion (unconvert)
			bits = uint64(t2 | (x>>6)&mask2)
							 ^
	internal/utf8/encode.go:37:16: unnecessary conversion (unconvert)
			bits = uint64(t3 | (x>>(6*2))&mask3)
							 ^
	internal/utf8/encode.go:42:16: unnecessary conversion (unconvert)
			bits = uint64(t4 | (x>>(6*3))&mask4)
							 ^

* flac: fix golangci lint issues

	encode_frame.go:89:1: cyclomatic complexity 52 of func `(*Encoder).encodeFrameHeader` is high (> 30) (gocyclo)
	func (enc *Encoder) encodeFrameHeader(w io.Writer, hdr frame.Header) error {
	^
	internal/utf8/encode.go:66:17: unnecessary conversion (unconvert)
			bits := uint64(tx | (x>>uint(6*i))&maskx)
							  ^
	encode_subframe.go:105:46: unnecessary conversion (unconvert)
			if err := bw.WriteBits(uint64(sample), byte(hdr.Bit... (continued)

915 of 2064 relevant lines covered (44.33%)

168755.65 hits per line

Source Files on job 140.1