reflect: support for struct tag use by multiple packages

Each package using struct field tags assumes that
it is the only package storing data in the tag.
This CL adds support in package reflect for sharing
tags between multiple packages.  In this scheme, the
tags must be of the form

        key:"value" key2:"value2"

(raw strings help when writing that tag in Go source).

reflect.StructField's Tag field now has type StructTag
(a string type), which has method Get(key string) string
that returns the associated value.

Clients of json and xml will need to be updated.
Code that says

        type T struct {
                X int "name"
        }

should become

        type T struct {
                X int `json:"name"`  // or `xml:"name"`
        }

Use govet to identify struct tags that need to be changed
to use the new syntax.

R=r, r, dsymonds, bradfitz, kevlar, fvbommel, n13m3y3r
CC=golang-dev
https://golang.org/cl/4645069

src/pkg/json/decode_test.go

@@ -42,8 +42,9 @@ var (
 
 type badTag struct {
 	X string
-	Y string "y"
-	Z string "@#*%(#@"
+	Y string `json:"y"`
+	Z string `x:"@#*%(#@"`
+	W string `json:"@#$@#$"`
 }
 
 type unmarshalTest struct {
@@ -68,7 +69,7 @@ var unmarshalTests = []unmarshalTest{
 	{`{"x": 1}`, new(tx), tx{}, &UnmarshalFieldError{"x", txType, txType.Field(0)}},
 
 	// skip invalid tags
-	{`{"X":"a", "y":"b", "Z":"c"}`, new(badTag), badTag{"a", "b", "c"}, nil},
+	{`{"X":"a", "y":"b", "Z":"c", "W":"d"}`, new(badTag), badTag{"a", "b", "c", "d"}, nil},
 
 	// syntax errors
 	{`{"X": "foo", "Y"}`, nil, nil, &SyntaxError{"invalid character '}' after object key", 17}},
@@ -250,7 +251,7 @@ type All struct {
 	Float32 float32
 	Float64 float64
 
-	Foo string "bar"
+	Foo string `json:"bar"`
 
 	PBool    *bool
 	PInt     *int