0.13.0 Title Screen

Features

• #204 #210 Title screen with dust effect and wind sound
• #204 scene fade-out and fade-in
• #183 dotted lines show connected cities
• #81 set start location in Editor

Dev setup

• #198 wait for pending builds on heroku
• #191 automerge
• #190 open PR on branch push
• document several helpful tools, e.g. dat.GUI