lib/ignore: Replace lib/fnmatch with github.com/gobwas/glob

Because it's literally ten times faster:



	benchmark                  old ns/op     new ns/op     delta

	BenchmarkMatch-8           13842         1200          -91.33%

	BenchmarkMatchCached-8     139           147           +5.76%



	benchmark                  old allocs     new allocs     delta

	BenchmarkMatch-8           0              0              +0.00%

	BenchmarkMatchCached-8     0              0              +0.00%



	benchmark                  old bytes     new bytes     delta

	BenchmarkMatch-8           12            0             -100.00%

	BenchmarkMatchCached-8     0             0             +0.00%

vendor/github.com/gobwas/glob/match/match.go

@@ -0,0 +1,81 @@
+package match
+
+// todo common table of rune's length
+
+import (
+	"fmt"
+	"strings"
+)
+
+const lenOne = 1
+const lenZero = 0
+const lenNo = -1
+
+type Matcher interface {
+	Match(string) bool
+	Index(string) (int, []int)
+	Len() int
+	String() string
+}
+
+type Matchers []Matcher
+
+func (m Matchers) String() string {
+	var s []string
+	for _, matcher := range m {
+		s = append(s, fmt.Sprint(matcher))
+	}
+
+	return fmt.Sprintf("%s", strings.Join(s, ","))
+}
+
+// appendMerge merges and sorts given already SORTED and UNIQUE segments.
+func appendMerge(target, sub []int) []int {
+	lt, ls := len(target), len(sub)
+	out := make([]int, 0, lt+ls)
+
+	for x, y := 0, 0; x < lt || y < ls; {
+		if x >= lt {
+			out = append(out, sub[y:]...)
+			break
+		}
+
+		if y >= ls {
+			out = append(out, target[x:]...)
+			break
+		}
+
+		xValue := target[x]
+		yValue := sub[y]
+
+		switch {
+
+		case xValue == yValue:
+			out = append(out, xValue)
+			x++
+			y++
+
+		case xValue < yValue:
+			out = append(out, xValue)
+			x++
+
+		case yValue < xValue:
+			out = append(out, yValue)
+			y++
+
+		}
+	}
+
+	target = append(target[:0], out...)
+
+	return target
+}
+
+func reverseSegments(input []int) {
+	l := len(input)
+	m := l / 2
+
+	for i := 0; i < m; i++ {
+		input[i], input[l-i-1] = input[l-i-1], input[i]
+	}
+}