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/single.go

@@ -0,0 +1,43 @@
+package match
+
+import (
+	"fmt"
+	"github.com/gobwas/glob/runes"
+	"unicode/utf8"
+)
+
+// single represents ?
+type Single struct {
+	Separators []rune
+}
+
+func NewSingle(s []rune) Single {
+	return Single{s}
+}
+
+func (self Single) Match(s string) bool {
+	r, w := utf8.DecodeRuneInString(s)
+	if len(s) > w {
+		return false
+	}
+
+	return runes.IndexRune(self.Separators, r) == -1
+}
+
+func (self Single) Len() int {
+	return lenOne
+}
+
+func (self Single) Index(s string) (int, []int) {
+	for i, r := range s {
+		if runes.IndexRune(self.Separators, r) == -1 {
+			return i, segmentsByRuneLength[utf8.RuneLen(r)]
+		}
+	}
+
+	return -1, nil
+}
+
+func (self Single) String() string {
+	return fmt.Sprintf("<single:![%s]>", string(self.Separators))
+}