Use Survey For Interactions With User (#186)

fixes

Use Survey For Interactions With User

Add Vendor "github.com/AlecAivazis/survey/v2"

Co-authored-by: Norwin Roosen <git@nroo.de>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/186
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Norwin <noerw@noreply.gitea.io>

vendor/github.com/AlecAivazis/survey/v2/terminal/buffered_reader.go

@@ -0,0 +1,22 @@
+package terminal
+
+import (
+	"bytes"
+	"io"
+)
+
+type BufferedReader struct {
+	In     io.Reader
+	Buffer *bytes.Buffer
+}
+
+func (br *BufferedReader) Read(p []byte) (int, error) {
+	n, err := br.Buffer.Read(p)
+	if err != nil && err != io.EOF {
+		return n, err
+	} else if err == nil {
+		return n, nil
+	}
+
+	return br.In.Read(p[n:])
+}