Pipes can now be (re)named

Pipes can now be named by using pen on a fitting. It replaces the name entirely, works the same as changing a pipe machinery's name (pump, mixer, etc) in map editor. Now also works for pre-named regular pipes (distro and waste loops, for example). To revert name to default, input nothing. Fitting's name doesn't change.

Sorry, no ability to recolor pipes bundled, so they all will still be bland grey.

P.S. Is it possible to pre-input existing variable into input proc's field?