refactor: decouple gotty app with terminal backends

backends/interface.go

@@ -0,0 +1,19 @@
+package backends
+
+import (
+	"io"
+	"net/url"
+)
+
+type ClientContextManager interface {
+	New(params url.Values) (ClientContext, error)
+}
+
+type ClientContext interface {
+	WindowTitle() (string, error)
+	Start(exitCh chan bool)
+	InputWriter() io.Writer
+	OutputReader() io.Reader
+	ResizeTerminal(width, height uint16) error
+	TearDown() error
+}