[NJ] Event Calendar & Year Clock

Adds a clock to the bottom bar, next to Earnings. It shows how far the current reporting period has run: yearly statistics and upkeep follow a fixed cycle of game time (24:21 min at 1x), not the calendar. Click the clock to open the event calendar: every vehicle and train that appeared in or left the store since the game started, and every one that will, grouped by year. The list opens at the latest unlocked year; past years stay above it, and future years show the game time left at the current calendar speed. Each row shows the vehicle type, engine and cargo specialization, and the list can be filtered by any of them. Click a model to see the same vehicle details as in the vehicle store. Infrastructure is listed too: roads, tracks, bridges, tunnels, stations and depots that become available or can no longer be built, including new versions of town roads and depots, as well as catenary, bus lanes and traffic lights. Also shows when inflation raises construction costs. Available in all 13 languages of the game. Changes no game mechanics and stores nothing in the savegame.