cue: make internal cue port main API implementation

- rm cue/*.go
- mv internal/legacy/cue/*.go cue/
- rename imports
- go

Change-Id: I553ce372ad457b1d73126b0a3f7be8224e415e80
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/6742
Reviewed-by: CUE cueckoo <cueckoo@gmail.com>
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/encoding/jsonschema/constraints.go b/encoding/jsonschema/constraints.go
index 7eeaf63..ef941e2 100644
--- a/encoding/jsonschema/constraints.go
+++ b/encoding/jsonschema/constraints.go
@@ -20,11 +20,11 @@
 	"path"
 	"regexp"
 
+	"cuelang.org/go/cue"
 	"cuelang.org/go/cue/ast"
 	"cuelang.org/go/cue/errors"
 	"cuelang.org/go/cue/token"
 	"cuelang.org/go/internal"
-	"cuelang.org/go/internal/legacy/cue"
 )
 
 // TODO: skip invalid regexps containing ?! and foes.
diff --git a/encoding/jsonschema/decode.go b/encoding/jsonschema/decode.go
index a1d1144..54f8fd6 100644
--- a/encoding/jsonschema/decode.go
+++ b/encoding/jsonschema/decode.go
@@ -24,12 +24,12 @@
 	"sort"
 	"strings"
 
+	"cuelang.org/go/cue"
 	"cuelang.org/go/cue/ast"
 	"cuelang.org/go/cue/ast/astutil"
 	"cuelang.org/go/cue/errors"
 	"cuelang.org/go/cue/token"
 	"cuelang.org/go/internal"
-	"cuelang.org/go/internal/legacy/cue"
 )
 
 // rootDefs defines the top-level name of the map of definitions that do not
diff --git a/encoding/jsonschema/decode_test.go b/encoding/jsonschema/decode_test.go
index 08ed07f..adc5bd6 100644
--- a/encoding/jsonschema/decode_test.go
+++ b/encoding/jsonschema/decode_test.go
@@ -24,13 +24,13 @@
 	"strings"
 	"testing"
 
+	"cuelang.org/go/cue"
 	"cuelang.org/go/cue/ast"
 	"cuelang.org/go/cue/errors"
 	"cuelang.org/go/cue/format"
 	"cuelang.org/go/cue/token"
 	"cuelang.org/go/encoding/json"
 	"cuelang.org/go/encoding/yaml"
-	"cuelang.org/go/internal/legacy/cue"
 	"github.com/google/go-cmp/cmp"
 	"github.com/stretchr/testify/assert"
 	"golang.org/x/tools/txtar"
diff --git a/encoding/jsonschema/jsonschema.go b/encoding/jsonschema/jsonschema.go
index 6451157..9e81b73 100644
--- a/encoding/jsonschema/jsonschema.go
+++ b/encoding/jsonschema/jsonschema.go
@@ -31,9 +31,9 @@
 package jsonschema
 
 import (
+	"cuelang.org/go/cue"
 	"cuelang.org/go/cue/ast"
 	"cuelang.org/go/cue/token"
-	"cuelang.org/go/internal/legacy/cue"
 )
 
 // Extract converts JSON Schema data into an equivalent CUE representation.
diff --git a/encoding/jsonschema/ref.go b/encoding/jsonschema/ref.go
index c57253c..26443fe 100644
--- a/encoding/jsonschema/ref.go
+++ b/encoding/jsonschema/ref.go
@@ -20,11 +20,11 @@
 	"strconv"
 	"strings"
 
+	"cuelang.org/go/cue"
 	"cuelang.org/go/cue/ast"
 	"cuelang.org/go/cue/errors"
 	"cuelang.org/go/cue/token"
 	"cuelang.org/go/internal"
-	"cuelang.org/go/internal/legacy/cue"
 )
 
 func (d *decoder) parseRef(p token.Pos, str string) []string {