Sync go parser with fishman-ctags

New features include:
* struct/interface detection
* struct member parsing
* function prototype parsing

tests/ctags/test.go

@@ -15,8 +15,11 @@ type (
 )
 
 type T6 struct {
-	a, b, c, d int
-	e float32
+	_a, _b, _c, _d int
+	int
+	T1 `annotation`
+	*T2
+	_e float32
 	//ignored int
 }
 
@@ -44,4 +47,4 @@ func (tt * T7) f4(a func () func ()) (func (), int) {return func (){}, 1};func f
 func main() {
 	go func (){}()
 	fmt.Println("Hello, 世界")
-}
+}
\ No newline at end of file

tests/ctags/test.go.tags

@@ -12,23 +12,28 @@ T1
 T240960
 T340960
 T440960
-T540960
-T640960
+T5320
+T620480
 T740960
 T840960
 T940960
+_a64T60
+_b64T60
+_c64T60
+_d64T60
+_e64T60
 a163840
 b163840
 c163840
 d163840
 e163840
 f163840
-f1160
-f2160
-f3160
-f4160
-f5160
+f116()0
+f216()0
+f316()0
+f416(a func () func ())0
+f516()0
 g163840
 h163840
-main160
+main16()0
 main2560