little ui rework: moved all time text rendering into the TimeText (+ GUIText) component, to make it easier adaptable
added line info label in lower right corner to display infos relevant to the highlighted station's line
enhanced label infos for hovered station and it's line info
also: different intervals per line type
refactored the travel time calculation a little, to make next steps possible (enter/exit times will get random influence), where the needed time should only be calculated once. also makes code better readable
enter cost of stations are now randomized a little; this should only happen if the time is used in travel, but not if estimating approximately (for labels)
added base scene to build