Switch to new vendor directory layout

Fixes #113

Signed-off-by: Marcos Lilljedahl <marcosnils@gmail.com>

vendor/github.com/Azure/go-ansiterm/escape_state.go

@@ -0,0 +1,47 @@
+package ansiterm
+
+type EscapeState struct {
+	BaseState
+}
+
+func (escState EscapeState) Handle(b byte) (s State, e error) {
+	logger.Infof("EscapeState::Handle %#x", b)
+	nextState, err := escState.BaseState.Handle(b)
+	if nextState != nil || err != nil {
+		return nextState, err
+	}
+
+	switch {
+	case b == ANSI_ESCAPE_SECONDARY:
+		return escState.parser.CsiEntry, nil
+	case b == ANSI_OSC_STRING_ENTRY:
+		return escState.parser.OscString, nil
+	case sliceContains(Executors, b):
+		return escState, escState.parser.execute()
+	case sliceContains(EscapeToGroundBytes, b):
+		return escState.parser.Ground, nil
+	case sliceContains(Intermeds, b):
+		return escState.parser.EscapeIntermediate, nil
+	}
+
+	return escState, nil
+}
+
+func (escState EscapeState) Transition(s State) error {
+	logger.Infof("Escape::Transition %s --> %s", escState.Name(), s.Name())
+	escState.BaseState.Transition(s)
+
+	switch s {
+	case escState.parser.Ground:
+		return escState.parser.escDispatch()
+	case escState.parser.EscapeIntermediate:
+		return escState.parser.collectInter()
+	}
+
+	return nil
+}
+
+func (escState EscapeState) Enter() error {
+	escState.parser.clear()
+	return nil
+}