Ignore LRC file tags

[barraIhsan]

An addition for #48, currently lrclib uses artist metadata to mark song as instrumental
[ar: instrumental]

But somehow, sptlrx fail? to parse the metadata, it will show up
umental]

I tried to set the .ignoreErrors to false hoping to see any error printed out, but there are no error

[raitonoberu]

Right now we are using a pretty naive algorithm to parse the .lrc file:

sptlrx/services/local/local.go

Lines 113 to 136 in c03f1cb

	func parseLrcFile(reader io.Reader) []lyrics.Line {
	result := []lyrics.Line{}
	scanner := bufio.NewScanner(reader)
	for scanner.Scan() {
	line := scanner.Text()
	if !strings.HasPrefix(line, "[") || len(line) < 10 {
	continue
	}
	result = append(result, parseLrcLine(line))
	}
	return result
	}
	func parseLrcLine(line string) lyrics.Line {
	// [00:00.00]text -> {"time": 0, "words": "text"}
	h, _ := strconv.Atoi(line[1:3])
	m, _ := strconv.Atoi(line[4:6])
	s, _ := strconv.Atoi(line[7:9])
	return lyrics.Line{
	Time: h*60*1000 + m*1000 + s*10,
	Words: line[10:],
	}
	}

So, we assume that every line starting with [ is a lyrics line, but, according to the Wiki page, a file can also contain various metadata (tags).

[YanceyChiew]

This design also results in lyrics files which accurate to milliseconds (the format may not comply with the specification, but if we want to support variable-length lrc tags, solving the problems they bring is just a dropping by) will be displayed with a ] symbol at the beginning of the line during rendering.