* create new action: git switch If the branch already exists in local, switch to that. If the branch is only in remote, create new branch tracking remote and switch to new one. * fix a point of review * fix a point of review: map to git-switch action * Revert "fix a point of review" This reverts commit 017ce424a3adfe1b3712a421385cfc3f4258a0fb. * undocument header comment