Revert "Switch to new vendor directory layout"

This reverts commit d5742209d3.

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

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

@@ -1,24 +0,0 @@
-package ansiterm
-
-type GroundState struct {
-	BaseState
-}
-
-func (gs GroundState) Handle(b byte) (s State, e error) {
-	gs.parser.context.currentChar = b
-
-	nextState, err := gs.BaseState.Handle(b)
-	if nextState != nil || err != nil {
-		return nextState, err
-	}
-
-	switch {
-	case sliceContains(Printables, b):
-		return gs, gs.parser.print()
-
-	case sliceContains(Executors, b):
-		return gs, gs.parser.execute()
-	}
-
-	return gs, nil
-}