Ignore flag handles type

[alexuserid]

Add ability to ignore types. Similar to ignoring packages.
It is useful when we have code like below and a lot of code calls status.String(), so it has a lot of input arrows on graph

type Status string

func (s Status) String() string {
  return s
}

Before:

Output for

go-callvis -algo rta -group type,pkg -focus github.com/syncthing/syncthing/lib/upgrade -limit github.com/syncthing/syncthing -ignore github.com/syncthing/syncthing/lib/logger,github.com/syncthing/syncthing/internal/db/sqlite,github.com/syncthing/syncthing/lib/connections,github.com/syncthing/syncthing/internal/db/olddb/backend,github.com/syncthing/syncthing/lib/fs,github.com/syncthing/syncthing/lib/osutil,github.com/syncthing/syncthing/internal/db github.com/syncthing/cmd/syncthing/

---

After:

Output for

go-callvis -algo rta -group type,pkg -focus github.com/syncthing/syncthing/lib/upgrade -limit github.com/syncthing/syncthing -ignore github.com/syncthing/syncthing/lib/logger,github.com/syncthing/syncthing/internal/db/sqlite,github.com/syncthing/syncthing/lib/connections,github.com/syncthing/syncthing/internal/db/olddb/backend,github.com/syncthing/syncthing/lib/fs,github.com/syncthing/syncthing/lib/osutil,github.com/syncthing/syncthing/internal/db,'*github.com/syncthing/syncthing/cmd/syncthing.autoclosedFile' github.com/syncthing/cmd/syncthing/

Added flag -ignore '*github.com/syncthing/syncthing/cmd/syncthing.autoclosedFile'